diff --git a/tictactoe.py b/tictactoe.py
index 984bf76..8538aa0 100644
--- a/tictactoe.py
+++ b/tictactoe.py
@@ -131,5 +131,6 @@ def get_score(state: GameState, target: Player) -> float:
 
 if __name__ == "__main__":
     # TODO: "get best move"
+    # TODO: rotational / reflectional board parity (for less total nodes)
     print(f"{START=}, {get_score(START, 'X')=}")
     print(f"{total_nodes=}")  # 5478