diff --git a/misc/ruby-mode.el b/misc/ruby-mode.el
index 39fc4a6..451e72e 100644
--- a/misc/ruby-mode.el
+++ b/misc/ruby-mode.el
@@ -129,7 +129,9 @@
   (define-key ruby-mode-map "\t" 'ruby-indent-command)
   (define-key ruby-mode-map "\C-c\C-e" 'ruby-insert-end)
   (define-key ruby-mode-map "\C-j" 'ruby-reindent-then-newline-and-indent)
-  (define-key ruby-mode-map "\C-m" 'newline))
+  (define-key ruby-mode-map "\C-m" 'newline)
+  (define-key ruby-mode-map "\C-c\C-c" 'comment-region)
+  (define-key ruby-mode-map "\C-c\C-u" 'uncomment-region))
 
 (defvar ruby-mode-syntax-table nil
   "Syntax table in use in ruby-mode buffers.")