diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index b273f017b7d..48a8938c355 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2010-08-24  Kevin Ryde  <user42@zip.com.au>
+
+	* progmodes/ruby-mode.el (ruby): Add defgroup.
+
 2010-08-24  Chong Yidong  <cyd@stupidchicken.com>
 
 	* progmodes/python.el: Add Ipython support (Bug#5390).
diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index a75c5b01bb8..0b92234bf1c 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -43,6 +43,11 @@
 
 (eval-when-compile (require 'cl))
 
+(defgroup ruby nil
+  "Major mode for editing Ruby code."
+  :prefix "ruby-"
+  :group 'languages)
+
 (defconst ruby-keyword-end-re
   (if (string-match "\\_>" "ruby")
       "\\_>"