diff --git a/actionpack/lib/action_view/helpers/text_helper.rb b/actionpack/lib/action_view/helpers/text_helper.rb
index 46af3012d9..3bc5afc2c4 100644
--- a/actionpack/lib/action_view/helpers/text_helper.rb
+++ b/actionpack/lib/action_view/helpers/text_helper.rb
@@ -263,7 +263,7 @@ module ActionView
#
# post_body = "Welcome to my new blog at http://www.myblog.com/. Please e-mail me at me@email.com."
# auto_link(post_body, :html => { :target => '_blank' }) do |text|
- # truncate(text, 15)
+ # truncate(text, :length => 15)
# end
# # => "Welcome to my new blog at http://www.m....
# Please e-mail me at me@email.com."