diff --git a/binarycpython/utils/grid.py b/binarycpython/utils/grid.py
index df959c4fc70cb3edfd15cfa98b75c39b317e0e16..a487989ad17c9a5e94df01783f1fa343a61f790e 100644
--- a/binarycpython/utils/grid.py
+++ b/binarycpython/utils/grid.py
@@ -358,6 +358,7 @@ class Population:
                 == number - 1
             ):
                 return grid_variable
+
     def add_grid_variable(
         self,
         name: str,