Add Ruby User's Guide

8df41f41 · fernando-barajas · cc1b699f · 8df41f41
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free-programming-books.md free-programming-books.md +1 -0

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--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -887,6 +887,7 @@ See also [TeX](#tex)
 * [Ruby Learning](http://rubylearning.com/)
 * [Try Ruby](http://tryruby.org/)
 * [Ruby Koans](http://www.rubykoans.com/)
+* [Ruby User's Guide](http://www.rubyist.net/~slagell/ruby/)


 ###Ruby on Rails