diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 1b5d0cf..520509f 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -3,6 +3,8 @@
 
 [序和前言](Ch00_Forword_and_Introduction.md)
 
+---
+
 - [入门](Ch01_Getting_Started.md)
 
 - [编写一个猜数游戏](Ch02_Programming_a_Guessing_Game.md)