diff --git a/admin_manual/configuration_server/security_setup_warnings.rst b/admin_manual/configuration_server/security_setup_warnings.rst
index aa8124ae2..e8ab5e574 100644
--- a/admin_manual/configuration_server/security_setup_warnings.rst
+++ b/admin_manual/configuration_server/security_setup_warnings.rst
@@ -31,6 +31,18 @@ you need to upgrade, or, if you're not using it, remove it.
 You are not required to use any caches, but caches improve server performance. 
 See :doc:`caching_configuration`.
 
+Transactional file locking
+--------------------------
+
+"Transactional file locking is disabled, this might lead to issues with race
+conditions."
+
+"Transactional file locking is using the database as locking backend, for best
+performance it's advised to configure a memcache for locking."
+
+Please see :doc:`../configuration_files/files_locking_transactional` on how
+to correctly configure your environment for transactional file locking.
+
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