diff --git a/free-programming-books-zh.md b/free-programming-books-zh.md
index 63dc9ae7bd82b91b9fb7bf80d9e4f467c76d6d29..614a77dfcc451c15a14644316864e1af771cfeec 100644
--- a/free-programming-books-zh.md
+++ b/free-programming-books-zh.md
@@ -169,6 +169,7 @@
 
 ### PHP
 * [深入理解 PHP 内核](http://www.php-internals.com/book/)
+* [PHP5中文手册](http://php.jz123.cn/)
 * [PHP扩展开发及内核应用](http://www.walu.cc/phpbook/preface.md)
 * [Symfony2 实例教程](http://wusuopu.gitbooks.io/symfony2_tutorial/content)