diff --git a/readme.md b/readme.md
index b2dc9fe..a16e0a0 100644
--- a/readme.md
+++ b/readme.md
@@ -346,6 +346,7 @@ Creative coding is a different discipline than programming systems. The goal is
 - [The newbie's PBR Cheat Sheet](https://www.artstation.com/artwork/YeBr3) - Short and sweet visual overview on PBR.
 - [PixelSpirit](http://pixelspiritdeck.com/) - GLSL library on the back of tarot cards, for learning and reference.
 - [Procedural Patterns And Noises](http://www.neilblevins.com/cg_education/procedural_noise/procedural_noise.html) - Collection of procedural patterns and procedural noises.
+- [Three.js Reference](https://www.udacity.com/wiki/cs291/threejs-reference) - Reference from the Udacity Interactive 3D Graphics course.
 
 
 ## Communities