From ebddb78293a7901799d6aeba24d80f42301c13fa Mon Sep 17 00:00:00 2001
From: Nyholm <tobias.nyholm@gmail.com>
Date: Wed, 31 Mar 2021 09:24:36 +0200
Subject: [PATCH] [Validator] Add warning about closure not being cachable

---
 reference/constraints/Callback.rst | 7 +++++++
 1 file changed, 7 insertions(+)

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
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