diff --git a/lang/en.php b/lang/en.php
index ac657cc..755761a 100644
--- a/lang/en.php
+++ b/lang/en.php
@@ -22,6 +22,7 @@ return array(
     'date' => "Invalid date",
     'dateFormat' => "Must be date with format '%s'",
     'dateBefore' => "Must be date before '%s'",
-    'dateAfter' => "Must be date after '%s'"
+    'dateAfter' => "Must be date after '%s'",
+    'contains' => "Must contain %s"
 );