diff --git a/CHANGELOG-2.1.md b/CHANGELOG-2.1.md
index 0afc7360..9c1ed3b9 100644
--- a/CHANGELOG-2.1.md
+++ b/CHANGELOG-2.1.md
@@ -11,6 +11,7 @@ in 2.1 minor versions.
 
  * The id for referencing the registry have been changed from `doctrine.odm.mongodb`
    to `doctrine_mongodb`.
+ * All service ids have had their prefix changed from `doctrine.odm.mongodb` to `doctrine_mongodb.odm`
 
 ### Events