diff --git a/README.md b/README.md
index 48aefeb..c81f76e 100644
--- a/README.md
+++ b/README.md
@@ -119,6 +119,13 @@
     * [MQTT](./06-NetworkIot/README.md#-mqtt)
     * [HTTP/HTTPS](./06-NetworkIot/README.md#http--https)
     * [CoAP/LwM2M](./06-NetworkIot/README.md#coap--lwm2m)
+  * [TCP/IP 协议栈基础与嵌入式实现](./06-NetworkIot/README.md#tcpip-协议栈基础与嵌入式实现)
+    * [TCP/IP 协议栈分层结构（四层模型）](./06-NetworkIot/README.md#tcpip-协议栈分层结构四层模型)
+    * [TCP 与 UDP 区别](./06-NetworkIot/README.md#tcp-与-udp-区别)
+    * [嵌入式 TCP/IP 协议栈组件](./06-NetworkIot/README.md#嵌入式-tcpip-协议栈组件)
+    * [嵌入式 TCP/IP 通信流程](./06-NetworkIot/README.md#嵌入式-tcpip-通信流程以-lwip-为例)
+    * [常用 API 示例](./06-NetworkIot/README.md#常用-api-示例lwip-bsd-socket)
+    * [DHCP / DNS / ICMP 说明](./06-NetworkIot/README.md#dhcp--dns--icmp-说明)
   * [云平台接入 & OTA 实现](./06-NetworkIot/README.md#云平台接入--ota-实现)
     * [云平台对接](./06-NetworkIot/README.md#云平台对接)
     * [OTA 升级机制](./06-NetworkIot/README.md#OTA-升级机制)