diff --git a/index.html b/index.html
index 974e7e7e..33be25a4 100644
--- a/index.html
+++ b/index.html
@@ -25,7 +25,7 @@
     window.$docsify = {
       name: 'JavaGuide',
       repo: 'https://github.com/Snailclimb/JavaGuide',
-      maxLevel: 3,//最大支持渲染的标题层级
+      maxLevel: 4,//最大支持渲染的标题层级
       coverpage: true,//封面,_coverpage.md
       auto2top: true,//切换页面后是否自动跳转到页面顶部
       //ga: 'UA-138586553-1',