diff --git a/arrays_and_strings/array-duplicate-zeros.py b/arrays_and_strings/array-duplicate-zeros.py
index 78b61c9..2a68490 100644
--- a/arrays_and_strings/array-duplicate-zeros.py
+++ b/arrays_and_strings/array-duplicate-zeros.py
@@ -1,3 +1,7 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
 # Given a fixed-length integer array arr, duplicate each occurrence of zero, 
 # shifting the remaining elements to the right.
 
@@ -30,4 +34,4 @@ def duplicate_zeros(arr: list[int]) -> list[int]:
 if __name__ == "__main__":
 
     arr = [1, 0, 2, 3, 0, 4, 5, 0]
-    print(duplicate_zeros(arr))
\ No newline at end of file
+    print(duplicate_zeros(arr))