diff --git a/TODO.md b/TODO.md
index 3762895b9..419b9b8eb 100644
--- a/TODO.md
+++ b/TODO.md
@@ -7,6 +7,7 @@
   - note input via piano
   - input pad
   - settings
+- RF5C68 system
 - OPN system
 - OPNA system
 - ZX beeper system