diff --git a/phpBB/language/en/acp/common.php b/phpBB/language/en/acp/common.php
index a75a965dcb..30a6508484 100644
--- a/phpBB/language/en/acp/common.php
+++ b/phpBB/language/en/acp/common.php
@@ -235,6 +235,7 @@ $lang = array_merge($lang, array(
'LOOK_UP_FORUMS_EXPLAIN'=> 'You are able to select more than one forum',
'MANAGE' => 'Manage',
+ 'MENU_TOGGLE' => 'Hide or display the side menu',
'MOVE_DOWN' => 'Move down',
'MOVE_UP' => 'Move up',