diff --git a/README.md b/README.md
index 9cb0e49..e835555 100644
--- a/README.md
+++ b/README.md
@@ -25,9 +25,16 @@ $ xcaddy build --with clevergo.tech/caddy-dnspodcn
 `Caddyfile` example:
 
 ```nginx
+## defines a dnspodcn snippet
+(dnspodcn) {
+    dns dnspodcn APP_ID APP_TOKEN
+}
+
+
 domain.tld {
     tls {
-        dns dnspodcn <APP_ID> <APP_TOKEN>
+        # imports dnspodcn setting.
+        import dnspodcn
     }
 }
 ```