diff --git a/components/serializer.rst b/components/serializer.rst
index 3c50d1b193c..3f31b8edaab 100644
--- a/components/serializer.rst
+++ b/components/serializer.rst
@@ -129,7 +129,7 @@ use the Serializer service created before::
 
     $jsonContent = $serializer->serialize($person, 'json');
 
-    // $jsonContent contains {"name":"foo","age":99,"sportsperson":false}
+    // $jsonContent contains {"name":"foo","age":99,"sportsperson":false,"createdAt":null}
 
     echo $jsonContent; // or return it in a Response