[Cookbook][Serializer] fix wording

xabbuh · xabbuh · commit 5dcca79ea5b2 · 2016-02-09T17:47:25.000+01:00
diff --git a/cookbook/serializer.rst b/cookbook/serializer.rst
@@ -178,7 +178,8 @@ Enabling the Metadata Cache
 ---------------------------
 
 .. versionadded:: 2.7
-    Serializer was introduced in Symfony 2.7.
+    Serializer metadata and the ability to cache them were introduced in
+    Symfony 2.7.
 
 Metadata used by the Serializer component such as groups can be cached to
 enhance application performance. Any service implementing the ``Doctrine\Common\Cache\Cache``
