diff --git a/free-programming-books-es.md b/free-programming-books-es.md
index d255cadd6483631207056e92c31aa251f242359a..49ec2ada303ea9deac713dbb9ebff7bfb18f23af 100644
--- a/free-programming-books-es.md
+++ b/free-programming-books-es.md
@@ -18,6 +18,7 @@
 * [Java](#java)
 * [Python](#python)
 * [Ruby](#ruby)
+* [Ruby on Rails](#ruby-on-rails)
 * [R](#R)
 
 ###Metalistas
@@ -117,6 +118,10 @@
 * [Guía para aprender a programar con Ruby. Adaptación al español del libro "Learn to Program" de Chris Pine](https://github.com/rubyperu/aprende.a.programar)
 * [Ruby en 20 minutos](https://www.ruby-lang.org/es/documentation/quickstart/)
 
+###Ruby on Rails
+
+* [El maldito libro de los Descarrilados](https://yottabi.com/mld.pdf) (PDF)
+
 ###R
 * [R para Principiantes](http://cran.r-project.org/doc/contrib/rdebuts_es.pdf)
 * [An Introduction to R](http://cran.r-project.org/doc/contrib/R-intro-1.1.0-espanol.1.pdf)