Rails Guides publishing delay?

I was just wondering why the published Rails Getting Started
guidehttp://guides.rubyonrails.org/getting_started.htmlseems to be so
far behind the source
at
Githubhttps://github.com/rails/rails/blob/master/guides/source/getting_started.md.

Read http://edgeguides.rubyonrails.org


Dheeraj K.