diff --git a/README.md b/README.md
index 3efb603..5e38686 100644
--- a/README.md
+++ b/README.md
@@ -184,8 +184,8 @@
 - [第二章：数据的表示和运算](https://github.com/ddy-ddy/cs-408/tree/master/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BB%84%E6%88%90%E5%8E%9F%E7%90%86)
 - [第三章：存储系统](https://github.com/ddy-ddy/cs-408/tree/master/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BB%84%E6%88%90%E5%8E%9F%E7%90%86)
 - [第四章：指令系统](https://github.com/ddy-ddy/cs-408/tree/master/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BB%84%E6%88%90%E5%8E%9F%E7%90%86)
-
 - [第五章：中央处理器](https://github.com/ddy-ddy/cs-408/tree/master/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BB%84%E6%88%90%E5%8E%9F%E7%90%86)
+- [第六章：总线](https://github.com/ddy-ddy/cs-408/tree/master/%E8%AE%A1%E7%AE%97%E6%9C%BA%E7%BB%84%E6%88%90%E5%8E%9F%E7%90%86)