diff --git a/yt_experiments/tiled_grid/tiled_grid.py b/yt_experiments/tiled_grid/tiled_grid.py
index c6d2eef..d5d3031 100644
--- a/yt_experiments/tiled_grid/tiled_grid.py
+++ b/yt_experiments/tiled_grid/tiled_grid.py
@@ -11,9 +11,10 @@
 
 def _validate_edge(edge: npt.ArrayLike, ds: Dataset):
     if not isinstance(edge, unyt.unyt_array):
-        return ds.arr(edge, 'code_length')
+        return ds.arr(edge, "code_length")
     return edge
 
+
 def _validate_nd_int(nd: int, x: int | npt.ArrayLike) -> npt.NDArray:
     if isinstance(x, int):
         x = (x,) * nd
@@ -22,6 +23,7 @@ def _validate_nd_int(nd: int, x: int | npt.ArrayLike) -> npt.NDArray:
         raise ValueError("Variable must have a length of 3")
     return x
 
+
 class YTTiledArbitraryGrid:
 
     _ndim = 3