diff --git a/README.md b/README.md
index 821079a..3bf824b 100644
--- a/README.md
+++ b/README.md
@@ -102,6 +102,7 @@ This is primarly material and resources for beginners, if you're a rock-start ch
 - [Visualizing Algorithms](https://bost.ocks.org/mike/algorithms/) - A look at the use of visualization to understand, explain and debug algorithms.
 - [Custom shaders with Three.JS](https://csantosbh.wordpress.com/2014/01/09/custom-shaders-with-three-js-uniforms-textures-and-lighting/) - Introduction to custom shaders, uniforms, textures and lighting in three.js.
 - [Modern OpenGL Series](https://github.com/tomdalling/opengl-series) - Good introduction to some of the OpenGL terms.
+- [An intro to modern OpenGL](http://duriansoftware.com/joe/An-intro-to-modern-OpenGL.-Chapter-1:-The-Graphics-Pipeline.html) - First part of an introduction to modern OpenGL. 
 
 
 ## Math