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.
+
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