diff --git a/tools/readme_wordcount.py b/tools/readme_wordcount.py
index 771e763..8462fda 100644
--- a/tools/readme_wordcount.py
+++ b/tools/readme_wordcount.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 from __future__ import print_function
 import glob
 import re