diff --git a/control/Session.php b/control/Session.php
index 20a9c3905..8c24d3ba5 100644
--- a/control/Session.php
+++ b/control/Session.php
@@ -86,7 +86,7 @@
 class Session {
 
 	/**
-	 * @var $timeout Set session timeout
+	 * @var $timeout Set session timeout in seconds.
 	 * @config
 	 */
 	private static $timeout = 0;