diff --git a/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt b/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
index 01f93964035784f92af9230d7e396e2dd0b4836c..fee9eb9456113a28a3ca3151f2a3a1611fb241b7 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/environments/development.rb.tt
@@ -35,7 +35,7 @@
   # Do not compress assets.
   config.assets.compress = false
 
-  # Expands the lines which load the assets.
+  # Debug mode disables concatenation and preprocessing of assets.
   config.assets.debug = true
   <%- end -%>