diff --git a/CHANGELOG-2.1.md b/CHANGELOG-2.1.md
index 5f18c0e07624..042aa57b8531 100644
--- a/CHANGELOG-2.1.md
+++ b/CHANGELOG-2.1.md
@@ -251,8 +251,8 @@ To get the diff between two versions, go to https://github.com/symfony/symfony/c
  * the radio type is now a child of the checkbox type
  * the collection, choice (with multiple selection) and entity (with multiple
    selection) types now make use of addXxx() and removeXxx() methods in your
-   model. For a custom, non-recognized singular form, set the "property_path"
-   option like this: "plural|singular"
+   model if you set "by_reference" to false. For a custom, non-recognized
+   singular form, set the "property_path" option like this: "plural|singular"
  * forms now don't create an empty object anymore if they are completely
    empty and not required. The empty value for such forms is null.
  * added constant Guess::VERY_HIGH_CONFIDENCE