diff --git a/arrays_and_strings/array-check-if-exist.py b/arrays_and_strings/array-check-if-exist.py
index b15f3ca..268aff7 100644
--- a/arrays_and_strings/array-check-if-exist.py
+++ b/arrays_and_strings/array-check-if-exist.py
@@ -1,3 +1,7 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
 """
 Given an array arr of integers, check if there exist two indices i and j such that :
 
@@ -24,4 +28,4 @@ def check_if_exist(arr: list[int]) -> bool:
 if __name__ == "__main__":
 
     arr = [-2, 0, 10, -19, 4, 6, -8]
-    print(check_if_exist(arr)) 
\ No newline at end of file
+    print(check_if_exist(arr))