warning parenthesize argument scrubyt

I've follow the scrubyt tutorial for installation then I found
examples into github http://github.com/scrubber/scrubyt_examples but
when I compile that example compare this warning

builder.rb:272: warning : parenthesize argument(s) for future version

and then nothing else happens

someone can help me?

This is just a warning and should not stop your code from working

I've been getting the same warning in my rails app since upgrading to
1.4.0, but my tests continue to pass. (I only use nokogiri in the