diff --git a/arrays_and_strings/array-check_mountain.py b/arrays_and_strings/array-check_mountain.py
index aaf9456..029f20e 100644
--- a/arrays_and_strings/array-check_mountain.py
+++ b/arrays_and_strings/array-check_mountain.py
@@ -1,3 +1,7 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
 '''
 Given an array of integers arr, return true if and only if it is a valid mountain array.
 
@@ -36,4 +40,4 @@ def valid_mountain_array(arr: list[int]) -> bool:
 
 if __name__ == "__main__":
     arr = [0,3,2,1]
-    print(valid_mountain_array(arr))
\ No newline at end of file
+    print(valid_mountain_array(arr))