diff --git a/free-programming-books.md b/free-programming-books.md
index 0bbc3a194e2fc27b44a30195315fb9e9177069d4..699c67a001334096e6e8cabe8bc9bd616dd9595b 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -1486,6 +1486,7 @@ See also [TeX](#tex)
 * [Ruby on Rails Guides](http://guides.rubyonrails.org)
 * [Ruby on Rails Tutorial: Learn Rails By Example](http://ruby.railstutorial.org/ruby-on-rails-tutorial-book)
 * [Ruby on Rails 3.2 - Step by Step](http://www.xyzpub.com/en/ruby-on-rails/3.2/)
+* [Ruby on Rails 4.0 Guide](http://www.xyzpub.com/en/ruby-on-rails/4.0/)
 * [Upgrading to Rails 4](https://github.com/alindeman/upgradingtorails4)