diff --git a/shading/wn.py b/shading/wn.py
index b8ef583..4d4ab68 100644
--- a/shading/wn.py
+++ b/shading/wn.py
@@ -42,7 +42,8 @@ def invoke(self, context, event):
             return {'FINISHED'}
 
         for obj in context.selected_objects:
-            new_modifier(obj, 'Weighted Normal — ND WN', 'WEIGHTED_NORMAL', rectify=False)
+            mod = new_modifier(obj, 'Weighted Normal — ND WN', 'WEIGHTED_NORMAL', rectify=False)
+            mod.keep_sharp = True
 
         return {'FINISHED'}