diff --git a/bin/1.1_footprint_extraction/footprints_extraction.py b/bin/1.1_footprint_extraction/footprints_extraction.py
index d1b0f8f..3176162 100644
--- a/bin/1.1_footprint_extraction/footprints_extraction.py
+++ b/bin/1.1_footprint_extraction/footprints_extraction.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 
 """
 footprints_extraction script uses the uncontinuous score from a bigWig file to estimate footpints within peaks of interest.