diff --git a/CHANGES.md b/CHANGES.md
index 1322fe29b..4ca222f6b 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,9 @@
+unreleased
+
+  + ocaml-index
+    - Improve the granularity of index reading by segmenting the marshalization
+      of the involved data-structures. (#1889)
+
 merlin 5.4.1
 ============
 Mon Jan 13 10:55:42 CET 2025