diff --git a/security.rst b/security.rst
index d29f1480f78..3db9857f17a 100644
--- a/security.rst
+++ b/security.rst
@@ -2503,9 +2503,10 @@ However, in some cases, this process can cause unexpected authentication problem
 If you're having problems authenticating, it could be that you *are* authenticating
 successfully, but you immediately lose authentication after the first redirect.
 
-In that case, review the serialization logic (e.g. ``SerializableInterface``) on
-you user class (if you have any) to make sure that all the fields necessary are
-serialized.
+In that case, review the serialization logic (e.g. the ``__serialize()`` or
+``serialize()`` methods) on you user class (if you have any) to make sure
+that all the fields necessary are serialized and also exclude all the
+fields not necessary to be serialized (e.g. Doctrine relations).
 
 Comparing Users Manually with EquatableInterface
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~