diff --git a/README.md b/README.md
index 766c030..a84e3fb 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,9 @@
 # rxr_docker_compose
 
+## DNS
+
+linux添加dns服务器时记得使用
+
+```
+echo "nameserver <zerotier_dns_ip>" | sudo tee -a /etc/resolv.conf
+```