diff --git a/TODO.md b/TODO.md
index 81a8bf5..9e16b58 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,4 +1,3 @@
 
 - [ ] Replace assert with custom Z85_ASSERT
-- [ ] z85.hpp/z85_impl.cpp shouldn't depend on z85.h/z85.cpp
 - [ ] generate single-include for both C and C++