diff --git a/todo.txt b/todo.txt
index 551c7c7..e92e75c 100644
--- a/todo.txt
+++ b/todo.txt
@@ -7,6 +7,10 @@ features:
 - Helper functions for e.g. retrieving and caching UV coords etc. Maybe these
   should be in a separate file?
 
+- PC == 2 (and possibly 1) could likely be accelerated by not using interpolate
+  functions, but rather FastLerStates for the values recomputed after each
+  row segment.
+
 - function for computing normals and lighting
 
 - triangle sorting: