diff --git a/subfiles/README.md b/subfiles/README.md
index cb7fb577..d65f860d 100644
--- a/subfiles/README.md
+++ b/subfiles/README.md
@@ -7,8 +7,9 @@
   - [Are links vulnerable to MITM attack?](about.ismm.md)
   - [Which website rejected me?](about.urjm.md)
 - Service
-  - [Ss](service.sercxi.md)
+  - [Public DNS](service.publicdns.md)
   - [Alternative Link](service.altlink.md)
+  - [Ss](service.sercxi.md)
 - Cloudflared
   - [How many % of top 1,000 most visited sites(2010) are using Cloudflare today?](cloudflared_top1000-2010-google.md)
   - [How many % of top 1,000 most visited sites(2019) are using Cloudflare today?](cloudflared_top1000-2019-alexa.md)