diff --git a/free-programming-books-de.md b/free-programming-books-de.md
index 413935833b4c1e5651f1fa710b38b41eaff0686b..82988dd09c54c75433e20b834ab250ddef6672bc 100644
--- a/free-programming-books-de.md
+++ b/free-programming-books-de.md
@@ -3,8 +3,8 @@
 * [iOS](#ios)
 * [Java](#java)
 * [Python](#python)
-* [Ruby on Rails]
-* [Visual Basic]
+* [Ruby on Rails](#ruby_on_rails)
+* [Visual Basic](#visual_basic)
 
 ###Android