diff --git a/bit_manipulation/count_1s.py b/bit_manipulation/count_1s.py
index 5b5862b..b841a8e 100644
--- a/bit_manipulation/count_1s.py
+++ b/bit_manipulation/count_1s.py
@@ -1,3 +1,8 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
+
 def count_ones(n: int) -> int:
         
         counter = 0