diff --git a/SUMMARY.md b/SUMMARY.md
index 9976663..e56402f 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -3,4 +3,5 @@
 * [简介](README.md)
 * [第一章, 网络、线缆、OSI及TCP模型](d01-Networks-Cables-OSI-and-TCP-Models.md)
 * [第二章, CSMA/CD, 交换和虚拟局域网](d02-CSMA-CD-Switching-and-VLANs.md)
+* [中继、DTP 及 VLAN 间路由](d03-Trunking-DTP-and-Inter-VLAN-Routing.md)