diff --git a/hospital-affiliations/aff_hosp.py b/hospital-affiliations/aff_hosp.py
index 2667c57..47a22f6 100755
--- a/hospital-affiliations/aff_hosp.py
+++ b/hospital-affiliations/aff_hosp.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 # flake8: noqa E501 (line length)
 
 import pandas as pd