diff --git a/stacks_and_queues/moving_average.py b/stacks_and_queues/moving_average.py
index 5733348..23b260f 100644
--- a/stacks_and_queues/moving_average.py
+++ b/stacks_and_queues/moving_average.py
@@ -1,3 +1,7 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
 '''
 Given a stream of integers and a window size, calculate the moving average of all integers in the sliding window.