diff --git a/free-programming-books-nl.md b/free-programming-books-nl.md
index 5c9872a98c6c24bba0f26862c4c2e32c63c7f964..d708ba265ed1839c72022db45956c788967524ea 100644
--- a/free-programming-books-nl.md
+++ b/free-programming-books-nl.md
@@ -1,13 +1,22 @@
 ### Index
 
+* [Java](#java)
 * [PHP](#php)
   * [Symfony](#symfony)
 * [Python](#python)
 * [Scratch](#scratch)
 
 
+### Java
+
+* [Programmeren in Java](https://nl.wikibooks.org/wiki/Programmeren_in_Java) (Wikibooks)
+
+
 ### PHP
 
+* [Programmeren in PHP](https://nl.wikibooks.org/wiki/Programmeren_in_PHP) (Wikibooks)
+
+
 #### Symfony
 
 * [Symfony 5: Snel van start](https://symfony.com/doc/current/the-fast-track/nl/index.html)