diff --git a/todo.md b/todo.md
index aba66852..5bc466b5 100644
--- a/todo.md
+++ b/todo.md
@@ -1,8 +1,17 @@
-* Add more pixmap fonts
-* Design ui system
-* Add color utilities
-* gfx::painter should be 2D only
-* gfx: think of some concepts like Renderable, Renderer, and how to wire those correctly
-* gfx: design & implement simple rendering pipelines
-* pcg: add clean Generator, Sampler & Pixmap processor concepts, uniformize interfaces, be type & dimension agnostic when possible
-* pcg: add more vector & point distributions
+* ui
+	* design & implement a ui engine
+	* separated logic & rendering & event handling
+* phx
+	* implement a 2D physics engine
+* gfx
+	* add more pixmap fonts
+	* painter should be 2D only, make a separate 3D painter
+	* implement proper .OBJ loader (with materials & vertex sharing)
+	* deferred renderer
+		* cascaded shadow maps
+		* CPU frustum culling
+		* solve banding issues
+		* figure out better light volumes clipping
+		* transparent objects
+		* get rid of diffuse materials
+		* find a better specular model (Blinn-Phong seems to over-shine the specular highlight)