diff --git a/chapter4/readme.md b/chapter4/readme.md
index 6609de21..b2100e35 100644
--- a/chapter4/readme.md
+++ b/chapter4/readme.md
@@ -12,4 +12,4 @@
 
 [tensorboardx](4.2.2-tensorboardx.ipynb)
 
-[可视化理解卷积神经网络](4.2.2-tensorboardx.ipynb)
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+[可视化理解卷积神经网络](4.2.3-cnn-visualizing.ipynb)
\ No newline at end of file