diff --git a/source/index.rst b/source/index.rst
index 6b87c1e..edc9d8e 100644
--- a/source/index.rst
+++ b/source/index.rst
@@ -1,10 +1,11 @@
 跟我一起写Makefile
 ==================
 
-目录:
+**本文中可能存在很多 typo 和小错误，欢迎 PR。**
 
 .. toctree::
    :maxdepth: 3
+   :caption: 目录
 
    overview
    introduction