diff --git a/config/config.sample.php b/config/config.sample.php
index 23e9cb5940afe..6f0a9b79e0af0 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -368,8 +368,10 @@
 
 /**
  * Enable or disable the automatic logout after session_lifetime, even if session
- * keepalive is enabled. This will make sure that an inactive browser will be logged out
- * even if requests to the server might extend the session lifetime.
+ * keepalive is enabled. This will make sure that an inactive browser will log itself out
+ * even if requests to the server might extend the session lifetime. Note: the logout is   
+ * handled on the client side. This is not a way to limit the duration of potentially
+ * compromised sessions.
  *
  * Defaults to ``false``
  */