diff --git a/free-programming-books.md b/free-programming-books.md
index ac1283141a4f9b5e273496e21ba5a2a5a2c463fe..ee586a54a7b058d5d66ce6e983b881af2caf2e32 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -499,6 +499,7 @@
 * [MIT OCW](http://ocw.mit.edu/index.htm)
 * [Platzi](https://courses.platzi.com)
 * [Udacity](https://www.udacity.com)
+* [openHPI](https://open.hpi.de)
 
 
 #### Networking