diff --git a/cookbook/security/api_key_authentication.rst b/cookbook/security/api_key_authentication.rst
index 41afcb03bc4..ee721e4894f 100644
--- a/cookbook/security/api_key_authentication.rst
+++ b/cookbook/security/api_key_authentication.rst
@@ -128,6 +128,11 @@ will cause authentication to fail. You might want to return ``null`` instead
to just skip the authentication, so Symfony can fallback to another authentication
method, if any.
+.. caution::
+
+ In case you return ``null`` from your ``createToken()`` method, be sure to enable
+ ``anonymous`` in you firewall. This way you'll be able to get an ``AnonymousToken``.
+
2. supportsToken
~~~~~~~~~~~~~~~~
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