diff --git a/free-programming-books-de.md b/free-programming-books-de.md
index d3bdcc99..1c901913 100644
--- a/free-programming-books-de.md
+++ b/free-programming-books-de.md
@@ -57,6 +57,7 @@
 
 ### C
 
+* [C-Programmierung](https://de.wikibooks.org/wiki/C-Programmierung) - Wikibooks (HTML)
 * [C von A bis Z](http://openbook.rheinwerk-verlag.de/c_von_a_bis_z/)
 * [Softwareentwicklung in C](https://web.archive.org/web/20190214185910/http://www.asc.tuwien.ac.at/~eprog/download/schmaranz.pdf) - Klaus Schmaranz (PDF)