diff --git a/README.md b/README.md
index 96bc7f6..f48d9ff 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@
 - [第二章：进程与线程](https://github.com/ddy-ddy/cs-408/tree/master/%E6%93%8D%E4%BD%9C%E7%B3%BB%E7%BB%9F/%E7%AC%AC%E4%BA%8C%E7%AB%A0%20%E8%BF%9B%E7%A8%8B%E4%B8%8E%E7%BA%BF%E7%A8%8B)
 - [第三章：内存管理](https://github.com/ddy-ddy/cs-408/tree/master/%E6%93%8D%E4%BD%9C%E7%B3%BB%E7%BB%9F/%E7%AC%AC%E4%B8%89%E7%AB%A0%20%E5%86%85%E5%AD%98%E7%AE%A1%E7%90%86)
 - [第四章：文件管理](https://github.com/ddy-ddy/cs-408/tree/master/%E6%93%8D%E4%BD%9C%E7%B3%BB%E7%BB%9F/%E7%AC%AC%E5%9B%9B%E7%AB%A0%20%E6%96%87%E4%BB%B6%E7%AE%A1%E7%90%86)
-- [第五章：I/O管理](https://github.com/ddy-ddy/cs-408/tree/master/%E6%93%8D%E4%BD%9C%E7%B3%BB%E7%BB%9F/%E7%AC%AC%E5%9B%9B%E7%AB%A0%20%E6%96%87%E4%BB%B6%E7%AE%A1%E7%90%86)
+- [第五章：I/O管理](https://github.com/ddy-ddy/cs-408/tree/master/%E6%93%8D%E4%BD%9C%E7%B3%BB%E7%BB%9F/%E7%AC%AC%E4%BA%94%E7%AB%A0%20IO%E7%AE%A1%E7%90%86)
 
 ## 计算机网络