diff --git a/trees_and_graphs/sum_2_numbers_with_bs.py b/trees_and_graphs/sum_2_numbers_with_bs.py
index c45c5f4..c18e38b 100644
--- a/trees_and_graphs/sum_2_numbers_with_bs.py
+++ b/trees_and_graphs/sum_2_numbers_with_bs.py
@@ -1,8 +1,10 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
 # given a collection of numbers, find the pair 
 # of numbers that sum to a given number
 
-
-
 def bs(array, desired_num):
 
     start = 0