diff --git a/README.md b/README.md
index a22aa63..fbdb24d 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,3 @@
 # database
 
+- [x] [Mysql](docs/mysql.md)
diff --git a/docs/mysql.md b/docs/mysql.md
index aad2c41..b755bbd 100644
--- a/docs/mysql.md
+++ b/docs/mysql.md
@@ -4,6 +4,7 @@
 
 <!-- TOC depthFrom:2 depthTo:2 -->
 
+- [知识点](#知识点)
 - [概念](#概念)
 - [SQL 基础](#sql-基础)
 - [增删改查](#增删改查)