diff --git a/actionmailer/lib/rails/generators/mailer/templates/mailer.rb b/actionmailer/lib/rails/generators/mailer/templates/mailer.rb
index 4d21c65101..370a508cad 100644
--- a/actionmailer/lib/rails/generators/mailer/templates/mailer.rb
+++ b/actionmailer/lib/rails/generators/mailer/templates/mailer.rb
@@ -6,7 +6,7 @@ class <%= class_name %> < ActionMailer::Base
   # Subject can be set in your I18n file at config/locales/en.yml
   # with the following lookup:
   #
-  #   en.<%= file_name %>.<%= action %>.subject
+  #   en.<%= file_path.gsub("/",".") %>.<%= action %>.subject
   #
   def <%= action %>
     @greeting = "Hi"