diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb
index ad097f2eb78e87060bfb6f2045310ae796a1616a..8e7224937d13aa4c6095e84f9a52217009befb2a 100644
--- a/actionpack/lib/action_view/helpers/form_helper.rb
+++ b/actionpack/lib/action_view/helpers/form_helper.rb
@@ -902,7 +902,7 @@ def text_area(object_name, method, options = {})
       #   # Let's say that @post.validated? is 1:
       #   check_box("post", "validated")
       #   # => <input name="post[validated]" type="hidden" value="0" />
-      #   #    <input type="checkbox" id="post_validated" name="post[validated]" value="1" />
+      #   #    <input checked="checked" type="checkbox" id="post_validated" name="post[validated]" value="1" />
       #
       #   # Let's say that @puppy.gooddog is "no":
       #   check_box("puppy", "gooddog", {}, "yes", "no")