diff --git a/app/lang/en/validation.php b/app/lang/en/validation.php
index a67a11488d1..86560b7096b 100644
--- a/app/lang/en/validation.php
+++ b/app/lang/en/validation.php
@@ -35,6 +35,7 @@
 	"exists"          => "The selected :attribute is invalid.",
 	"image"           => "The :attribute must be an image.",
 	"in"              => "The selected :attribute is invalid.",
+	"not_in"          => "The selected :attribute is invalid.",
 	"integer"         => "The :attribute must be an integer.",
 	"ip"              => "The :attribute must be a valid IP address.",
 	"match"           => "The :attribute format is invalid.",
@@ -88,4 +89,4 @@
 
 	'attributes' => array(),
 
-);
\ No newline at end of file
+);