diff --git a/similarities/tfidf.py b/similarities/tfidf.py
index 79def3c..1467c3e 100755
--- a/similarities/tfidf.py
+++ b/similarities/tfidf.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import fire
 from pyspark.sql import SparkSession
 from pyspark.sql import functions as f