diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 9febbdfdf..15c18b2e7 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -1719,6 +1719,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 
 ### PHP
 
+* [An Introduction to the PHP Programming Language](https://codeahoy.com/learn/php/toc/) - CodeAhoy (HTML)
 * [Clean Code PHP](https://github.com/jupeter/clean-code-php)
 * [PHP 5 Power Programming](http://www.informit.com/content/images/013147149X/downloads/013147149X_book.pdf) (PDF)
 * [PHP Apprentice](https://phpapprentice.com) - Andrew Davis *(:construction: in process)*