diff --git a/reference/constraints/Callback.rst b/reference/constraints/Callback.rst
index 6985f3953e1..65a63235a73 100644
--- a/reference/constraints/Callback.rst
+++ b/reference/constraints/Callback.rst
@@ -251,6 +251,13 @@ constructor of the Callback constraint::
         }
     }
 
+.. warning::
+
+    Using a ``Closure`` together with annotation configuration will disable the
+    annotation cache for that class/property/methods because ``Closure``s cannot
+    be cached. For best performance, it is recommended to use a static callback
+    method.
+
 Options
 -------