diff --git a/README.md b/README.md
index 6c947cf..b7d3a60 100644
--- a/README.md
+++ b/README.md
@@ -100,9 +100,12 @@ $ rye run flask run
 
 please access `127.0.0.1:5000`. it may not work if you use localhost.
 
-also, oauth doesn't work on localhost. use [ngrok](https://ngrok.com/), [tailscale](https://tailscale.com/).
+also, oauth doesn't work on localhost. use [ngrok](https://ngrok.com/), [tailscale](https://tailscale.com/), [cloudflare](https://github.com/cloudflare/cloudflared).
 
 ```sh
 $ ngrok http http://localhost:5000
 ```
 
+```sh
+$ cloudflared tunnel --url http://localhost:5000
+```