diff --git a/TODO.md b/TODO.md
index b93c6b2..3706e55 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,6 +2,11 @@
 
 ## game data structure
 
+add "move" functions for entities
+e.g. move(direction), teleport
+
+--
+
 add "from_dir" functions for structs
   make that function generic?