diff --git a/albow/palette_view.py b/albow/palette_view.py
index d915c9d..153b681 100644
--- a/albow/palette_view.py
+++ b/albow/palette_view.py
@@ -3,6 +3,7 @@ from grid_view import GridView
 from utils import frame_rect
 from theme import ThemeProperty
 
+
 class PaletteView(GridView):
     #  nrows   int   No. of displayed rows
     #  ncols   int   No. of displayed columns