diff --git a/CHANGES b/CHANGES
index 8a53dc22273..14a896cc74f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -7,6 +7,9 @@ Dependencies
 Incompatible changes
 --------------------
 
+* #9649: ``searchindex.js``: the embedded data has changed format to allow
+  objects with the same name in different domains.
+
 Deprecated
 ----------
 
@@ -24,7 +27,7 @@ Bugs fixed
 * #9630: autosummary: Failed to build summary table if :confval:`primary_domain`
   is not 'py'
 * #9670: html: Fix download file with special characters
-* HTML search: when objects have the same name but in different domains,
+* #9649: HTML search: when objects have the same name but in different domains,
   return all of them as result instead of just one.
 
 Testing