diff --git a/bip-0388/wallet_policies.py b/bip-0388/wallet_policies.py
old mode 100644
new mode 100755
index 42f615a2..4cd50310
--- a/bip-0388/wallet_policies.py
+++ b/bip-0388/wallet_policies.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 from typing import Iterable, List, Mapping, Tuple, Generator