diff --git a/railties/guides/rails_guides/generator.rb b/railties/guides/rails_guides/generator.rb
index 0a2170a09e..68d406e31c 100644
--- a/railties/guides/rails_guides/generator.rb
+++ b/railties/guides/rails_guides/generator.rb
@@ -32,7 +32,7 @@
 #
 #     Separate many using commas:
 #
-#       # generates only
+#       # generates only association_basics.html and migrations.html
 #       ONLY=assoc,migrations ruby rails_guides.rb
 #
 #     Note that if you are working on a guide generation will by default process