diff --git a/Login-required-for-public-server.md b/Login-required-for-public-server.md
index 1fca578..1440406 100644
--- a/Login-required-for-public-server.md
+++ b/Login-required-for-public-server.md
@@ -7,7 +7,7 @@ To help prevent scamming and potential [botnet attacks](https://github.com/rustd
 >
 > > Or we can find a better solution for the controlled side without requiring explicit login.
 > > e.g.
-> > - command line, --assign <assign-code>
+> > - command line, --assign [code]
 > > - invitation link for one time support
 >
 > # RustDesk is designed to be [self-hosted](https://www.reddit.com/r/rustdesk/comments/1cr8kfv/should_you_selfhost_a_rustdesk_server/). This public server is provided for _demonstration_ and _testing_ only. Please do not use it for production or sensitive work.