diff --git a/treenode/admin.py b/treenode/admin.py
index ff697f3..026adc0 100644
--- a/treenode/admin.py
+++ b/treenode/admin.py
@@ -5,7 +5,6 @@
 
 
 class TreeNodeModelAdmin(admin.ModelAdmin):
-
     """
     Usage: