diff --git a/stacks_and_queues/circular_queue.py b/stacks_and_queues/circular_queue.py
index a87fa47..546b5fa 100644
--- a/stacks_and_queues/circular_queue.py
+++ b/stacks_and_queues/circular_queue.py
@@ -1,3 +1,7 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
 ## implement a circular queue