diff --git a/TODO.md b/TODO.md
index 8a8059fdd..7634bc9e1 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,6 +4,8 @@
   - CSM
 - MSM6258 pitch and clock select
 - MSM6295 clock select
+- the last three compat flags
+- add OPL drum instrument type
 - Game Boy envelope macro/sequence
 - drag-and-drop ins/wave/sample loading
 - "set loop" in right click menu of sample editor