diff --git a/bin/3.1_create_gtf/RegGTFExtractor.py b/bin/3.1_create_gtf/RegGTFExtractor.py
index 9000341..6bdd251 100644
--- a/bin/3.1_create_gtf/RegGTFExtractor.py
+++ b/bin/3.1_create_gtf/RegGTFExtractor.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+
 """
 
 RegGTFExtractor.py extracts regulatory-data from Ensembl and UCSC databases