diff --git a/tree2book.md b/tree2book.md
index 3d742bb9e3368e76fe40b6a4e553d2cb0e8dc152..710b80adabf0672d87525186177603b35dacca31 100644
--- a/tree2book.md
+++ b/tree2book.md
@@ -122,9 +122,9 @@
 
 13.5.4
 
-### 2.6.5
+### 2.6.5 复杂连接
 
-无对应章节
+13.5.5
 
 ## 2.7 索引