diff --git a/data_structures/arrays/monotonic_array.py b/data_structures/arrays/monotonic_array.py
index 55850c54f..342d443a9 100644
--- a/data_structures/arrays/monotonic_array.py
+++ b/data_structures/arrays/monotonic_array.py
@@ -33,4 +33,5 @@ if __name__ == "__main__":
     print(is_monotonic([1, 3, 2]))  # Output: False
 
     import doctest
+
     doctest.testmod()