diff --git a/resources/lang/en/validation.php b/resources/lang/en/validation.php
index 0d47547aa9b..b163c4240e4 100644
--- a/resources/lang/en/validation.php
+++ b/resources/lang/en/validation.php
@@ -18,7 +18,7 @@
     'after'                => 'The :attribute must be a date after :date.',
     'after_or_equal'       => 'The :attribute must be a date after or equal to :date.',
     'alpha'                => 'The :attribute may only contain letters.',
-    'alpha_dash'           => 'The :attribute may only contain letters, numbers, and dashes.',
+    'alpha_dash'           => 'The :attribute may only contain letters, numbers, dashes and underscores.',
     'alpha_num'            => 'The :attribute may only contain letters and numbers.',
     'array'                => 'The :attribute must be an array.',
     'before'               => 'The :attribute must be a date before :date.',