diff --git a/chapter1/3_neural_networks_tutorial.ipynb b/chapter1/3_neural_networks_tutorial.ipynb
index 483d7dc..a07546e 100644
--- a/chapter1/3_neural_networks_tutorial.ipynb
+++ b/chapter1/3_neural_networks_tutorial.ipynb
@@ -212,7 +212,7 @@
     "\n",
     "**重点如下：**\n",
     "  -  定义一个网络\n",
-    "  -  处理输入，调用backword\n",
+    "  -  处理输入，调用backward\n",
     "\n",
     "**还剩：**\n",
     "  -  计算损失\n",