diff --git a/chapter04-neural_network/chapter4.ipynb b/chapter04-neural_network/chapter4.ipynb
index c1c59674..c1c312f8 100644
--- a/chapter04-neural_network/chapter4.ipynb
+++ b/chapter04-neural_network/chapter4.ipynb
@@ -558,7 +558,7 @@
     "for model in modellist:\n",
     "    input = model(input)\n",
     "# 下面会报错,因为modellist没有实现forward方法\n",
-    "# output = modelist(input)"
+    "# output = modellist(input)"
    ]
   },
   {