diff --git a/lib/gollum/app.rb b/lib/gollum/app.rb
index bf9c629c..eb8b2934 100644
--- a/lib/gollum/app.rb
+++ b/lib/gollum/app.rb
@@ -145,15 +145,15 @@ module Precious
     end
 
     get %r{/(edit|create)/custom\.(js|css)} do
-      forbid
+      forbid('Changing this resource is not allowed.')
     end
 
     post %r{/(deleteFile|rename|edit|create)/custom\.(js|css)} do
-      forbid
+      forbid('Changing this resource is not allowed.')
     end
 
     post %r{/revert/custom\.(js|css)/.*/.*} do
-      forbid
+      forbid('Changing this resource is not allowed.')
     end
 
     get '/edit/*' do