diff --git a/extensions/lang-english/locale/validation.yml b/extensions/lang-english/locale/validation.yml
index f8cbe88c0..4e0248592 100644
--- a/extensions/lang-english/locale/validation.yml
+++ b/extensions/lang-english/locale/validation.yml
@@ -4,7 +4,7 @@ validation:
   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."