--- ruby-mode.el.~1.11.~	2009-10-28 09:24:04.000000000 +1100
+++ ruby-mode.el	2010-05-09 10:10:06.000000000 +1000
@@ -204,6 +204,15 @@
     table)
   "Syntax table to use in Ruby mode.")
 
+(defgroup ruby nil "Ruby"
+  ;; No :prefix stripping, because taking the "ruby" off
+  ;; `ruby-indent-tabs-mode' and `ruby-comment-column' would leave
+  ;; them displaying the same as the plain `indent-tabs-mode' and
+  ;; `comment-column' whereas they're in fact distinct settings
+  ;; (affecting only ruby-mode).
+  :prefix ""
+  :group 'languages)
+
 (defcustom ruby-indent-tabs-mode nil
   "Indentation can insert tabs in Ruby mode if this is non-nil."
   :type 'boolean :group 'ruby)