diff --git a/changelogs/fragments/75-env-vars-modules.yml b/changelogs/fragments/75-env-vars-modules.yml
new file mode 100644
index 00000000..529d9a80
--- /dev/null
+++ b/changelogs/fragments/75-env-vars-modules.yml
@@ -0,0 +1,2 @@
+minor_changes:
+  - "Allow modules to declare environment variables (https://github.com/ansible-community/antsibull-docs/pull/75)."
diff --git a/src/antsibull_docs/data/docsite/list_of_env_variables.rst.j2 b/src/antsibull_docs/data/docsite/list_of_env_variables.rst.j2
index 6d6f27a0..261791b0 100644
--- a/src/antsibull_docs/data/docsite/list_of_env_variables.rst.j2
+++ b/src/antsibull_docs/data/docsite/list_of_env_variables.rst.j2
@@ -11,7 +11,7 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 {# TODO: use label `ansible_configuration_env_vars` once the ansible-core PR is merged #}
 
diff --git a/src/antsibull_docs/data/docsite/macros/parameters.rst.j2 b/src/antsibull_docs/data/docsite/macros/parameters.rst.j2
index 72c73b33..e9232703 100644
--- a/src/antsibull_docs/data/docsite/macros/parameters.rst.j2
+++ b/src/antsibull_docs/data/docsite/macros/parameters.rst.j2
@@ -99,12 +99,16 @@
       :ansible-option-default-bold:`Default:` :ansible-option-default:`@{ value['default'] | antsibull_to_json | rst_escape(escape_ending_whitespace=true) | indent(6, blank=true) }@`
 {%   endif %}
 {#   Configuration #}
-{%   if plugin_type != 'module' and plugin_type != 'role' and (value['ini'] or value['env'] or value['vars'] or value['cli']) %}
+{%   if plugin_type != 'role' and (value['ini'] or value['env'] or value['vars'] or value['cli']) %}
 
       .. rst-class:: ansible-option-line
 
       :ansible-option-configuration:`Configuration:`
 
+{%     if plugin_type == 'module' and value['env'] %}
+      The below environment variable{% if value['env'] | length > 1 %}s{% endif %} will be used on the host that executes this module.
+
+{%     endif %}
 {%     if value['ini'] %}
       - INI {% if value['ini'] | length == 1 %}entry{% else %}entries{% endif %}:
 {%       for ini in value['ini'] %}
@@ -132,7 +136,7 @@
 {%       endif %}
 @{       deprecates_rst(env['deprecated'], collection, 8, role_entrypoint=role_entrypoint) }@
 {%     endfor %}
-{%     for myvar in value['vars'] %}
+{%     for myvar in value['vars'] | default([]) %}
       - Variable: @{ myvar['name'] | rst_escape }@
 {%       if myvar['version_added'] is still_relevant(collection=myvar['version_added_collection'] or collection) %}
 
@@ -140,7 +144,7 @@
 {%       endif %}
 @{       deprecates_rst(myvar['deprecated'], collection, 8, role_entrypoint=role_entrypoint) }@
 {%     endfor %}
-{%     for kw in value['keyword'] %}
+{%     for kw in value['keyword'] | default([]) %}
       - Keyword: @{ kw['name'] | rst_escape }@
 {%       if kw['version_added'] is still_relevant(collection=kw['version_added_collection'] or collection) %}
 
@@ -148,7 +152,7 @@
 {%       endif %}
 @{       deprecates_rst(kw['deprecated'], collection, 8, role_entrypoint=role_entrypoint) }@
 {%     endfor %}
-{%     for mycli in value['cli'] %}
+{%     for mycli in value['cli'] | default([]) %}
       - CLI argument: @{ mycli['option'] | rst_escape }@
 {%       if mycli['version_added'] is still_relevant(collection=mycli['version_added_collection'] or collection) %}
 
@@ -228,8 +232,9 @@
       <p class="ansible-option-line"><span class="ansible-option-default-bold">Default:</span> <code class="ansible-value literal notranslate ansible-option-default">@{ value['default'] | antsibull_to_json | escape | indent(6, blank=true) }@</code></p>
 {%   endif %}
 {#   Configuration #}
-{%   if plugin_type != 'module' and plugin_type != 'role' and (value['ini'] or value['env'] or value['vars'] or value['cli']) %}
+{%   if plugin_type != 'role' and (value['ini'] or value['env'] or value['vars'] or value['cli']) %}
       <p class="ansible-option-line"><span class="ansible-option-configuration">Configuration:</span></p>
+      <p>The below environment variable{% if value['env'] | length > 1 %}s{% endif %} will be used on the host that executes this module.</p>
       <ul class="simple">
 {%     if value['ini'] %}
       <li>
@@ -257,7 +262,7 @@
 @{       deprecates_html(env['deprecated'], collection, role_entrypoint=role_entrypoint) }@
       </li>
 {%     endfor %}
-{%     for myvar in value['vars'] %}
+{%     for myvar in value['vars'] | default([]) %}
       <li>
         <p>Variable: @{ myvar['name'] | escape }@</p>
 {%       if myvar['version_added'] is still_relevant(collection=myvar['version_added_collection'] or collection) %}
@@ -266,7 +271,7 @@
 @{       deprecates_html(myvar['deprecated'], collection, role_entrypoint=role_entrypoint) }@
       </li>
 {%     endfor %}
-{%     for kw in value['keyword'] %}
+{%     for kw in value['keyword'] | default([]) %}
       <li>
         <p>Keyword: @{ kw['name'] | escape }@</p>
 {%       if kw['version_added'] is still_relevant(collection=kw['version_added_collection'] or collection) %}
@@ -275,7 +280,7 @@
 @{       deprecates_html(kw['deprecated'], collection, role_entrypoint=role_entrypoint) }@
       </li>
 {%     endfor %}
-{%     for mycli in value['cli'] %}
+{%     for mycli in value['cli'] | default([]) %}
       <li>
         <p>CLI argument: @{ mycli['option'] | escape }@</p>
 {%       if mycli['version_added'] is still_relevant(collection=mycli['version_added_collection'] or collection) %}
diff --git a/src/antsibull_docs/schemas/docs/module.py b/src/antsibull_docs/schemas/docs/module.py
index afb0df3b..90e928cc 100644
--- a/src/antsibull_docs/schemas/docs/module.py
+++ b/src/antsibull_docs/schemas/docs/module.py
@@ -10,10 +10,11 @@
 import pydantic as p
 
 from .base import BaseModel, DocSchema, OptionsSchema
-from .plugin import PluginExamplesSchema, PluginMetadataSchema, PluginReturnSchema
+from .plugin import OptionEnvSchema, PluginExamplesSchema, PluginMetadataSchema, PluginReturnSchema
 
 
 class InnerModuleOptionsSchema(OptionsSchema):
+    env: t.List[OptionEnvSchema] = []
     suboptions: t.Dict[str, 'InnerModuleOptionsSchema'] = {}
 
     @p.root_validator(pre=True)
@@ -29,6 +30,7 @@ def allow_description_to_be_optional(cls, values):
 
 
 class ModuleOptionsSchema(OptionsSchema):
+    env: t.List[OptionEnvSchema] = []
     suboptions: t.Dict[str, 'InnerModuleOptionsSchema'] = {}
 
 
diff --git a/tests/functional/ansible-doc-cache-all.json b/tests/functional/ansible-doc-cache-all.json
index e3c22086..60d6a6bd 100644
--- a/tests/functional/ansible-doc-cache-all.json
+++ b/tests/functional/ansible-doc-cache-all.json
@@ -1334,6 +1334,11 @@
       },
       "foo": {
        "description": "The foo source.",
+       "env": [
+        {
+         "name": "ANSIBLE_FOO"
+        }
+       ],
        "required": true,
        "type": "str"
       },
@@ -1346,12 +1351,30 @@
           "Whatever.",
           "Also required when O(subfoo) is specified when O(foo=bar) or V(baz)."
          ],
+         "env": [
+          {
+           "name": "ANSIBLE_FOO"
+          },
+          {
+           "name": "ANSIBLE_BAR",
+           "version_added": "2.2.0"
+          },
+          {
+           "deprecated": {
+            "alternatives": "use C(ANSIBLE_BAR)",
+            "removed_from_collection": "ns2.col",
+            "version": "4.0.0",
+            "why": "Will be gone."
+           },
+           "name": "ANSIBLE_BAZ"
+          }
+         ],
          "required": true,
          "type": "str"
         }
        },
        "type": "dict",
-       "version_added": "2.0.0",
+       "version_added": "2.1.0",
        "version_added_collection": "ns2.col"
       }
      },
diff --git a/tests/functional/ansible-doc-cache-ns2.col.json b/tests/functional/ansible-doc-cache-ns2.col.json
index 50c437fe..3d00f74b 100644
--- a/tests/functional/ansible-doc-cache-ns2.col.json
+++ b/tests/functional/ansible-doc-cache-ns2.col.json
@@ -1099,6 +1099,11 @@
       },
       "foo": {
        "description": "The foo source.",
+       "env": [
+        {
+         "name": "ANSIBLE_FOO"
+        }
+       ],
        "required": true,
        "type": "str"
       },
@@ -1111,12 +1116,30 @@
           "Whatever.",
           "Also required when O(subfoo) is specified when O(foo=bar) or V(baz)."
          ],
+         "env": [
+          {
+           "name": "ANSIBLE_FOO"
+          },
+          {
+           "name": "ANSIBLE_BAR",
+           "version_added": "2.2.0"
+          },
+          {
+           "deprecated": {
+            "alternatives": "use C(ANSIBLE_BAR)",
+            "removed_from_collection": "ns2.col",
+            "version": "4.0.0",
+            "why": "Will be gone."
+           },
+           "name": "ANSIBLE_BAZ"
+          }
+         ],
          "required": true,
          "type": "str"
         }
        },
        "type": "dict",
-       "version_added": "2.0.0",
+       "version_added": "2.1.0",
        "version_added_collection": "ns2.col"
       }
      },
diff --git a/tests/functional/ansible-version.output b/tests/functional/ansible-version.output
index 6ecde2c9..83745113 100644
--- a/tests/functional/ansible-version.output
+++ b/tests/functional/ansible-version.output
@@ -1,4 +1,4 @@
-ansible [core 2.15.0b1.post0] (stable-2.15 8f0ddcba2c) last updated 2023/04/06 20:47:29 (GMT +200)
+ansible [core 2.16.0.dev0] (devel 88a380c8f0) last updated 2023/04/06 20:47:05 (GMT +200)
   config file = None
   configured module search path = ['<<<<<HOME>>>>>/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
   ansible python module location = <<<<<ANSIBLE>>>>>
diff --git a/tests/functional/baseline-default/collections/environment_variables.rst b/tests/functional/baseline-default/collections/environment_variables.rst
index bc0f4d6b..8561546d 100644
--- a/tests/functional/baseline-default/collections/environment_variables.rst
+++ b/tests/functional/baseline-default/collections/environment_variables.rst
@@ -6,9 +6,35 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 
+.. envvar:: ANSIBLE_BAR
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
+.. envvar:: ANSIBLE_BAZ
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
+.. envvar:: ANSIBLE_FOO
+
+    See the documentations for the options where this environment variable is used.
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
 .. envvar:: ANSIBLE_FOO_EXE
 
     Foo executable.
diff --git a/tests/functional/baseline-default/collections/ns2/col/foo_module.rst b/tests/functional/baseline-default/collections/ns2/col/foo_module.rst
index bc56405a..0321b582 100644
--- a/tests/functional/baseline-default/collections/ns2/col/foo_module.rst
+++ b/tests/functional/baseline-default/collections/ns2/col/foo_module.rst
@@ -180,6 +180,15 @@ Parameters
       The foo source.
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variable will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+
       .. raw:: html
 
         </div>
@@ -203,7 +212,7 @@ Parameters
 
       :ansible-option-type:`dictionary`
 
-      :ansible-option-versionadded:`added in ns2.col 2.0.0`
+      :ansible-option-versionadded:`added in ns2.col 2.1.0`
 
 
       .. raw:: html
@@ -255,6 +264,28 @@ Parameters
       Also required when \ :ansopt:`ns2.col.foo#module:subfoo`\  is specified when \ :ansopt:`ns2.col.foo#module:foo=bar`\  or \ :ansval:`baz`\ .
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variables will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAR`
+
+        :ansible-option-versionadded:`added in ns2.col 2.2.0`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAZ`
+
+        Removed in: version 4.0.0
+
+        Why: Will be gone.
+
+        Alternative: use \ :literal:`ANSIBLE\_BAR`\ 
+
+
+
       .. raw:: html
 
         </div>
diff --git a/tests/functional/baseline-no-breadcrumbs/collections/environment_variables.rst b/tests/functional/baseline-no-breadcrumbs/collections/environment_variables.rst
index bc0f4d6b..8561546d 100644
--- a/tests/functional/baseline-no-breadcrumbs/collections/environment_variables.rst
+++ b/tests/functional/baseline-no-breadcrumbs/collections/environment_variables.rst
@@ -6,9 +6,35 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 
+.. envvar:: ANSIBLE_BAR
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
+.. envvar:: ANSIBLE_BAZ
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
+.. envvar:: ANSIBLE_FOO
+
+    See the documentations for the options where this environment variable is used.
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
 .. envvar:: ANSIBLE_FOO_EXE
 
     Foo executable.
diff --git a/tests/functional/baseline-no-breadcrumbs/collections/ns2/col/foo_module.rst b/tests/functional/baseline-no-breadcrumbs/collections/ns2/col/foo_module.rst
index bc56405a..0321b582 100644
--- a/tests/functional/baseline-no-breadcrumbs/collections/ns2/col/foo_module.rst
+++ b/tests/functional/baseline-no-breadcrumbs/collections/ns2/col/foo_module.rst
@@ -180,6 +180,15 @@ Parameters
       The foo source.
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variable will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+
       .. raw:: html
 
         </div>
@@ -203,7 +212,7 @@ Parameters
 
       :ansible-option-type:`dictionary`
 
-      :ansible-option-versionadded:`added in ns2.col 2.0.0`
+      :ansible-option-versionadded:`added in ns2.col 2.1.0`
 
 
       .. raw:: html
@@ -255,6 +264,28 @@ Parameters
       Also required when \ :ansopt:`ns2.col.foo#module:subfoo`\  is specified when \ :ansopt:`ns2.col.foo#module:foo=bar`\  or \ :ansval:`baz`\ .
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variables will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAR`
+
+        :ansible-option-versionadded:`added in ns2.col 2.2.0`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAZ`
+
+        Removed in: version 4.0.0
+
+        Why: Will be gone.
+
+        Alternative: use \ :literal:`ANSIBLE\_BAR`\ 
+
+
+
       .. raw:: html
 
         </div>
diff --git a/tests/functional/baseline-no-indexes/collections/environment_variables.rst b/tests/functional/baseline-no-indexes/collections/environment_variables.rst
index bc0f4d6b..8561546d 100644
--- a/tests/functional/baseline-no-indexes/collections/environment_variables.rst
+++ b/tests/functional/baseline-no-indexes/collections/environment_variables.rst
@@ -6,9 +6,35 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 
+.. envvar:: ANSIBLE_BAR
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
+.. envvar:: ANSIBLE_BAZ
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
+.. envvar:: ANSIBLE_FOO
+
+    See the documentations for the options where this environment variable is used.
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
 .. envvar:: ANSIBLE_FOO_EXE
 
     Foo executable.
diff --git a/tests/functional/baseline-no-indexes/collections/ns2/col/foo_module.rst b/tests/functional/baseline-no-indexes/collections/ns2/col/foo_module.rst
index bc56405a..0321b582 100644
--- a/tests/functional/baseline-no-indexes/collections/ns2/col/foo_module.rst
+++ b/tests/functional/baseline-no-indexes/collections/ns2/col/foo_module.rst
@@ -180,6 +180,15 @@ Parameters
       The foo source.
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variable will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+
       .. raw:: html
 
         </div>
@@ -203,7 +212,7 @@ Parameters
 
       :ansible-option-type:`dictionary`
 
-      :ansible-option-versionadded:`added in ns2.col 2.0.0`
+      :ansible-option-versionadded:`added in ns2.col 2.1.0`
 
 
       .. raw:: html
@@ -255,6 +264,28 @@ Parameters
       Also required when \ :ansopt:`ns2.col.foo#module:subfoo`\  is specified when \ :ansopt:`ns2.col.foo#module:foo=bar`\  or \ :ansval:`baz`\ .
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variables will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAR`
+
+        :ansible-option-versionadded:`added in ns2.col 2.2.0`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAZ`
+
+        Removed in: version 4.0.0
+
+        Why: Will be gone.
+
+        Alternative: use \ :literal:`ANSIBLE\_BAR`\ 
+
+
+
       .. raw:: html
 
         </div>
diff --git a/tests/functional/baseline-squash-hierarchy/environment_variables.rst b/tests/functional/baseline-squash-hierarchy/environment_variables.rst
index bc0f4d6b..8561546d 100644
--- a/tests/functional/baseline-squash-hierarchy/environment_variables.rst
+++ b/tests/functional/baseline-squash-hierarchy/environment_variables.rst
@@ -6,9 +6,35 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 
+.. envvar:: ANSIBLE_BAR
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
+.. envvar:: ANSIBLE_BAZ
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
+.. envvar:: ANSIBLE_FOO
+
+    See the documentations for the options where this environment variable is used.
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
 .. envvar:: ANSIBLE_FOO_EXE
 
     Foo executable.
diff --git a/tests/functional/baseline-squash-hierarchy/foo_module.rst b/tests/functional/baseline-squash-hierarchy/foo_module.rst
index bc56405a..0321b582 100644
--- a/tests/functional/baseline-squash-hierarchy/foo_module.rst
+++ b/tests/functional/baseline-squash-hierarchy/foo_module.rst
@@ -180,6 +180,15 @@ Parameters
       The foo source.
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variable will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+
       .. raw:: html
 
         </div>
@@ -203,7 +212,7 @@ Parameters
 
       :ansible-option-type:`dictionary`
 
-      :ansible-option-versionadded:`added in ns2.col 2.0.0`
+      :ansible-option-versionadded:`added in ns2.col 2.1.0`
 
 
       .. raw:: html
@@ -255,6 +264,28 @@ Parameters
       Also required when \ :ansopt:`ns2.col.foo#module:subfoo`\  is specified when \ :ansopt:`ns2.col.foo#module:foo=bar`\  or \ :ansval:`baz`\ .
 
 
+      .. rst-class:: ansible-option-line
+
+      :ansible-option-configuration:`Configuration:`
+
+      The below environment variables will be used on the host that executes this module.
+
+      - Environment variable: :envvar:`ANSIBLE\_FOO`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAR`
+
+        :ansible-option-versionadded:`added in ns2.col 2.2.0`
+
+      - Environment variable: :envvar:`ANSIBLE\_BAZ`
+
+        Removed in: version 4.0.0
+
+        Why: Will be gone.
+
+        Alternative: use \ :literal:`ANSIBLE\_BAR`\ 
+
+
+
       .. raw:: html
 
         </div>
diff --git a/tests/functional/baseline-use-html-blobs/collections/environment_variables.rst b/tests/functional/baseline-use-html-blobs/collections/environment_variables.rst
index bc0f4d6b..8561546d 100644
--- a/tests/functional/baseline-use-html-blobs/collections/environment_variables.rst
+++ b/tests/functional/baseline-use-html-blobs/collections/environment_variables.rst
@@ -6,9 +6,35 @@
 Index of all Collection Environment Variables
 =============================================
 
-The following index documents all environment variables declared by plugins in collections.
+The following index documents all environment variables declared by plugins and modules in collections.
 Environment variables used by the ansible-core configuration are documented in :ref:`ansible_configuration_settings`.
 
+.. envvar:: ANSIBLE_BAR
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
+.. envvar:: ANSIBLE_BAZ
+
+    A sub foo.
+
+    Whatever.
+
+    Also required when \ :ansopt:`subfoo`\  is specified when \ :ansopt:`foo=bar`\  or \ :ansval:`baz`\ .
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
+.. envvar:: ANSIBLE_FOO
+
+    See the documentations for the options where this environment variable is used.
+
+    *Used by:*
+    :ref:`ns2.col.foo module <ansible_collections.ns2.col.foo_module>`
 .. envvar:: ANSIBLE_FOO_EXE
 
     Foo executable.
diff --git a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_become.rst b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_become.rst
index becf20af..0d41ad3a 100644
--- a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_become.rst
+++ b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_become.rst
@@ -128,6 +128,7 @@ Parameters
       <p>Foo executable.</p>
       <p class="ansible-option-line"><span class="ansible-option-default-bold">Default:</span> <code class="ansible-value literal notranslate ansible-option-default">&#34;foo&#34;</code></p>
       <p class="ansible-option-line"><span class="ansible-option-configuration">Configuration:</span></p>
+      <p>The below environment variables will be used on the host that executes this module.</p>
       <ul class="simple">
       <li>
         <p>INI entries</p>
@@ -184,6 +185,7 @@ Parameters
       <p>User you &#x27;become&#x27; to execute the task.</p>
       <p class="ansible-option-line"><span class="ansible-option-default-bold">Default:</span> <code class="ansible-value literal notranslate ansible-option-default">&#34;root&#34;</code></p>
       <p class="ansible-option-line"><span class="ansible-option-configuration">Configuration:</span></p>
+      <p>The below environment variables will be used on the host that executes this module.</p>
       <ul class="simple">
       <li>
         <p>INI entries</p>
diff --git a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_cache.rst b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_cache.rst
index 601c500a..c5ac4d3e 100644
--- a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_cache.rst
+++ b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_cache.rst
@@ -109,6 +109,7 @@ Parameters
     <td><div class="ansible-option-cell">
       <p>Path in which the cache plugin will save the foo files.</p>
       <p class="ansible-option-line"><span class="ansible-option-configuration">Configuration:</span></p>
+      <p>The below environment variable will be used on the host that executes this module.</p>
       <ul class="simple">
       <li>
         <p>INI entry</p>
diff --git a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_connection.rst b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_connection.rst
index 663a95d4..40c24d1f 100644
--- a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_connection.rst
+++ b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_connection.rst
@@ -123,6 +123,7 @@ Parameters
       <p>Hostname to connect to.</p>
       <p class="ansible-option-line"><span class="ansible-option-default-bold">Default:</span> <code class="ansible-value literal notranslate ansible-option-default">&#34;inventory_hostname&#34;</code></p>
       <p class="ansible-option-line"><span class="ansible-option-configuration">Configuration:</span></p>
+      <p>The below environment variable will be used on the host that executes this module.</p>
       <ul class="simple">
       <li>
         <p>Variable: inventory_hostname</p>
diff --git a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_module.rst b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_module.rst
index cabbfb21..43309457 100644
--- a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_module.rst
+++ b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_module.rst
@@ -136,6 +136,14 @@ Parameters
     </div></td>
     <td><div class="ansible-option-cell">
       <p>The foo source.</p>
+      <p class="ansible-option-line"><span class="ansible-option-configuration">Configuration:</span></p>
+      <p>The below environment variable will be used on the host that executes this module.</p>
+      <ul class="simple">
+      <li>
+        <p>Environment variable: <code class="xref std std-envvar literal notranslate">ANSIBLE_FOO</code></p>
+
+      </li>
+      </ul>
     </div></td>
   </tr>
   <tr class="row-even">
@@ -146,7 +154,7 @@ Parameters
       <p class="ansible-option-type-line">
         <span class="ansible-option-type">dictionary</span>
       </p>
-      <p><span class="ansible-option-versionadded">added in ns2.col 2.0.0</span></p>
+      <p><span class="ansible-option-versionadded">added in ns2.col 2.1.0</span></p>
     </div></td>
     <td><div class="ansible-option-cell">
       <p>Some recursive foo.</p>
@@ -166,6 +174,26 @@ Parameters
       <p>A sub foo.</p>
       <p>Whatever.</p>
       <p>Also required when <code class="ansible-option literal notranslate"><strong><a class="reference internal" href="#parameter-subfoo"><span class="std std-ref"><span class="pre">subfoo</span></span></a></strong></code> is specified when <code class="ansible-option-value literal notranslate"><a class="reference internal" href="#parameter-foo"><span class="std std-ref"><span class="pre">foo=bar</span></span></a></code> or <code class="ansible-value literal notranslate">baz</code>.</p>
+      <p class="ansible-option-line"><span class="ansible-option-configuration">Configuration:</span></p>
+      <p>The below environment variables will be used on the host that executes this module.</p>
+      <ul class="simple">
+      <li>
+        <p>Environment variable: <code class="xref std std-envvar literal notranslate">ANSIBLE_FOO</code></p>
+
+      </li>
+      <li>
+        <p>Environment variable: <code class="xref std std-envvar literal notranslate">ANSIBLE_BAR</code></p>
+        <p><span class="ansible-option-versionadded">added in ns2.col 2.2.0</span></p>
+
+      </li>
+      <li>
+        <p>Environment variable: <code class="xref std std-envvar literal notranslate">ANSIBLE_BAZ</code></p>
+  <p>Removed in: version 4.0.0</p>
+  <p>Why: Will be gone.</p>
+  <p>Alternative: use <code class='docutils literal notranslate'>ANSIBLE_BAR</code></p>
+
+      </li>
+      </ul>
     </div></td>
   </tr>
 
diff --git a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_shell.rst b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_shell.rst
index b9e4b3a2..90533c0a 100644
--- a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_shell.rst
+++ b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_shell.rst
@@ -124,6 +124,7 @@ Parameters
       <p>Temporary directory to use on targets when executing tasks.</p>
       <p class="ansible-option-line"><span class="ansible-option-default-bold">Default:</span> <code class="ansible-value literal notranslate ansible-option-default">&#34;~/.ansible/tmp&#34;</code></p>
       <p class="ansible-option-line"><span class="ansible-option-configuration">Configuration:</span></p>
+      <p>The below environment variables will be used on the host that executes this module.</p>
       <ul class="simple">
       <li>
         <p>INI entry</p>
diff --git a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_vars.rst b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_vars.rst
index 871dfced..ed0f3c47 100644
--- a/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_vars.rst
+++ b/tests/functional/baseline-use-html-blobs/collections/ns2/col/foo_vars.rst
@@ -121,6 +121,7 @@ Parameters
       <p>All extensions to check.</p>
       <p class="ansible-option-line"><span class="ansible-option-default-bold">Default:</span> <code class="ansible-value literal notranslate ansible-option-default">[&#34;.foo&#34;, &#34;.foobar&#34;]</code></p>
       <p class="ansible-option-line"><span class="ansible-option-configuration">Configuration:</span></p>
+      <p>The below environment variable will be used on the host that executes this module.</p>
       <ul class="simple">
       <li>
         <p>INI entry</p>
diff --git a/tests/functional/collections/ansible_collections/ns2/col/plugins/modules/foo.py b/tests/functional/collections/ansible_collections/ns2/col/plugins/modules/foo.py
index 6e367124..931b1d8c 100644
--- a/tests/functional/collections/ansible_collections/ns2/col/plugins/modules/foo.py
+++ b/tests/functional/collections/ansible_collections/ns2/col/plugins/modules/foo.py
@@ -24,6 +24,8 @@
         description: The foo source.
         type: str
         required: true
+        env:
+          - name: ANSIBLE_FOO
     bar:
         description:
           - A bar.
@@ -35,7 +37,7 @@
           - baz
     subfoo:
         description: Some recursive foo.
-        version_added: 2.0.0
+        version_added: 2.1.0
         type: dict
         suboptions:
             foo:
@@ -45,6 +47,17 @@
                     - Also required when O(subfoo) is specified when O(foo=bar) or V(baz).
                 type: str
                 required: true
+                env:
+                  - name: ANSIBLE_FOO
+                  - name: ANSIBLE_BAR
+                    version_added: 2.2.0
+                  - name: ANSIBLE_BAZ
+                    deprecated:
+                        why: Will be gone.
+                        version: 4.0.0
+                        alternatives: use C(ANSIBLE_BAR)
+                        # TODO: remove once ansible-core supports env variable docs for modules
+                        removed_from_collection: ns2.col
 
 requirements:
     - Foo on remote.
diff --git a/tests/functional/schema/good_data/one_module_results.json b/tests/functional/schema/good_data/one_module_results.json
index 6427467b..a9f68b8d 100644
--- a/tests/functional/schema/good_data/one_module_results.json
+++ b/tests/functional/schema/good_data/one_module_results.json
@@ -214,6 +214,7 @@
                             "The groups to add the hostname to."
                         ],
                         "elements": "str",
+                        "env": [],
                         "required": false,
                         "suboptions": {},
                         "type": "list",
@@ -231,6 +232,7 @@
                             "The hostname/ip of the host to add to the inventory, can include a colon and a port number."
                         ],
                         "elements": "str",
+                        "env": [],
                         "required": true,
                         "suboptions": {},
                         "type": "str",