diff --git a/config/config.sample.php b/config/config.sample.php
index 1c65b050b7..228233452e 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -1454,6 +1454,7 @@ $CONFIG = array(
  * to performance degradation and large log files on busy instance.
  *
  * Thus enabling this in production for longer periods of time is not recommended
+ * or should be used together with the ``log.condition`` setting.
  */
 'filelocking.debug' => false,