diff --git a/.todo b/.todo
index 6664bc7..e368cdb 100644
--- a/.todo
+++ b/.todo
@@ -8,6 +8,7 @@ FART To-Do List
     - Multi-core rendering in non-distributed mode
     - Look into half-space pruning optimization
     - add fog support
+    - kd_tree optimization
 
   Low Priority:
     - Refraction