diff --git a/README.md b/README.md
index c744ffb..4b81771 100644
--- a/README.md
+++ b/README.md
@@ -212,6 +212,7 @@ A collection of resources to learn object-oriented programming and related conce
 ## Slides
 *Slides about object-oriented programming and related concepts.*
 
+* [The OOP in PHP](http://matthewturland.com/slides/phpoop-tutorial/) - An introductory tutorial to OOP concepts and terminology using PHP's object model as an example.
 * *...more to coming...*
 
 ## Courses