diff --git a/expat/Changes b/expat/Changes
index 4a6893a9..7fc211b1 100644
--- a/expat/Changes
+++ b/expat/Changes
@@ -23,7 +23,8 @@ Release 2.2.1 ??????????
                     https://github.com/libexpat/libexpat/pull/30/commits
                   Prevent use of uninitialised variable; commit
                     a4dc944f37b664a3ca7199c624a98ee37babdb4b
-                  Add missing parameter validation to public API functions:
+                  Add missing parameter validation to public API functions
+                    and dedicated error code XML_ERROR_INVALID_ARGUMENT:
                     * NULL checks; commits
                       * d37f74b2b7149a3a95a680c4c4cd2a451a51d60a (merge/many)
                       * 9ed727064b675b7180c98cb3d4f75efba6966681