diff --git a/free-programming-books-es.md b/free-programming-books-es.md
index 1be464481b7314d1f5816dd0f1766e89e8339167..842c1463061dd6a421e96391619a74f0f74b86d8 100644
--- a/free-programming-books-es.md
+++ b/free-programming-books-es.md
@@ -4,6 +4,7 @@
 * [Ensamblador](#ensamblador)
 * [Git](#git)
 * [Python](#python)
+* [Ruby](#ruby)
 * [Haskell](#haskell)