diff --git a/deeprank2/utils/grid.py b/deeprank2/utils/grid.py
index 392122ed..1efdbda6 100644
--- a/deeprank2/utils/grid.py
+++ b/deeprank2/utils/grid.py
@@ -1,4 +1,5 @@
 """This module holds the classes that are used when working with a 3D grid."""
+
 from __future__ import annotations
 
 import itertools