diff --git a/readme.md b/readme.md
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@@ -1,7 +1,9 @@
 # oglc
 
+specialised renderer for exploring gpgpu programming in c/opengl
+
 ## sources 
 
-[learnogengl](https://learnopengl.com/)
-[Anton's OpenGL 4 Tutorials](https://antongerdelan.net/opengl/compute.html)
-
+* [learnogengl](https://learnopengl.com/)
+* [ray tracing in one weekend](https://github.com/raytracing/raytracing.github.io)
+* [anton's opengl 4 tutorials](https://antongerdelan.net/opengl/compute.html)