diff --git a/todo.txt b/todo.txt
index 5dd5ac2..1f292f0 100644
--- a/todo.txt
+++ b/todo.txt
@@ -33,6 +33,8 @@ features:
 - Line and point drawing modes for triangles should maybe not overlap on
   adjacent triangles (as filled triangles already do)?
 - create demos
+- drawModel: create an option that would use a cache to not transform the same
+  point twice
 
 bugs: