diff --git a/docs/tech_docs/OpenWrt.md b/docs/tech_docs/OpenWrt.md
index 094d1ca..4d372f8 100644
--- a/docs/tech_docs/OpenWrt.md
+++ b/docs/tech_docs/OpenWrt.md
@@ -61,6 +61,10 @@ config interface 'lan'
         option netmask '255.255.255.0'
 ```
 
+```bash
+130 dd
+```
+
 ```bash
 vi /etc/config/firewall
 ```