diff --git a/nn/part3.py b/nn/part3.py
index cea4dff3..67188de8 100644
--- a/nn/part3.py
+++ b/nn/part3.py
@@ -2590,6 +2590,7 @@ class SimplestNetworkExample(PreviewLearning):
 
     def show_derivative_wrt_w(self):
         pass
+        
 
     def show_chain_of_events(self):
         pass