diff --git a/templates/dashboard.jinja b/templates/dashboard.jinja
index 002e778..d33438e 100644
--- a/templates/dashboard.jinja
+++ b/templates/dashboard.jinja
@@ -15,6 +15,11 @@
     </small>
   </h1>
   <hr/>
+  <div class="alert alert-secondary" role="alert">
+    If uploading fails without an error message, please try disabling
+    your ad blocker. It is known that some ad blockers will interfere
+    with uploads to the info-beamer CDN.
+  </div>
   <dashboard></dashboard>
 {% endblock %}