diff --git a/CHANGELOG-2.1.md b/CHANGELOG-2.1.md
index bdce39f925..348feb9eb6 100644
--- a/CHANGELOG-2.1.md
+++ b/CHANGELOG-2.1.md
@@ -95,6 +95,7 @@ To get the diff between two versions, go to https://github.com/symfony/symfony/c
 
 ### Config
 
+ * added a way to add documentation on configuration
  * implemented `Serializable` on resources
  * LoaderResolverInterface is now used instead of LoaderResolver for type hinting