gistfile1.diff

diff --git a/lib/paperclip.rb b/lib/paperclip.rb
index f40fe79..c043970 100644
--- a/lib/paperclip.rb
+++ b/lib/paperclip.rb
@@ -171,7 +171,7 @@ module Paperclip
     #   that can control permissions. You can specify the full domain and path, but usually
     #   just an absolute path is sufficient. The leading slash *must* be included manually for
     #   absolute paths. The default value is
-    #   "/system/:attachment/:id/:style/:filename". See
+    #   "/system/:class/:attachment/:id/:style/:filename". See
     #   Paperclip::Attachment#interpolate for more information on variable interpolaton.
     #     :url => "/:class/:attachment/:id/:style_:filename"
     #     :url => "http://some.other.host/stuff/:class/:id_:extension"
diff --git a/lib/paperclip/attachment.rb b/lib/paperclip/attachment.rb
index 39f0ac1..a685340 100644
--- a/lib/paperclip/attachment.rb
+++ b/lib/paperclip/attachment.rb
@@ -7,7 +7,7 @@ module Paperclip
 
     def self.default_options
       @default_options ||= {
-        :url               => "/system/:attachment/:id/:style/:filename",
+        :url               => "/system/:class/:attachment/:id/:style/:filename",
         :path              => ":rails_root/public:url",
         :styles            => {},
         :processors        => [:thumbnail],