diff --git a/_config.next.yml b/_config.next.yml
index 8b38f09..8320cc0 100644
--- a/_config.next.yml
+++ b/_config.next.yml
@@ -188,11 +188,11 @@ toc:
   # Automatically add list number to toc.
   number: true
   # If true, all words will placed on next lines if header width longer then sidebar width.
-  wrap: true
+  wrap: true # controlled only by top level
   # If true, all level of TOC in a post will be displayed, rather than the activated part of it.
-  expand_all: false
+  expand_all: false # controlled only by top level
   # Maximum heading depth of generated toc.
-  max_depth: 6
+  max_depth: 3
 
 
 # ---------------------------------------------------------------
diff --git a/source/_posts/2023-04-08-oxford-5000-pitch.md b/source/_posts/2023-04-08-oxford-5000-pitch.md
index c990ee2..6f43217 100644
--- a/source/_posts/2023-04-08-oxford-5000-pitch.md
+++ b/source/_posts/2023-04-08-oxford-5000-pitch.md
@@ -7,10 +7,10 @@ comments: true
 copyright: false
 toc:
   enable: true
-  number: 'yes'
+  number: true
   wrap: true
   expand_all: true
-  max_depth: 4
+  max_depth: 3
 categories:
   - 英语学习
 abbrlink: 279fbed9