diff --git a/free-programming-books-es.md b/free-programming-books-es.md
index 7a7cbaa8ca2447cf70071138505e1bc45cb6a17e..8dd7f803f678e53c01371b54f766b808a30b7818 100644
--- a/free-programming-books-es.md
+++ b/free-programming-books-es.md
@@ -226,6 +226,7 @@
 
 ####Ruby on Rails
 * [El maldito libro de los Descarrilados](http://yottabi.com/mld.pdf) (PDF)
+* [Introducción a Rails](http://rubysur.org/introduccion.a.rails/)
 
 
 ###R