diff --git a/README.md b/README.md
index 5f8608e..ed0812c 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ xmind auth status
 If sign-in is required:
 
 ```bash
-xmind auth login
+xmind auth login <cn|global>
 ```
 
 Ask the user to complete authorization in the browser, then run `xmind auth status`
diff --git a/skills/xmind-file/SKILL.md b/skills/xmind-file/SKILL.md
index efa2704..c21b556 100644
--- a/skills/xmind-file/SKILL.md
+++ b/skills/xmind-file/SKILL.md
@@ -23,7 +23,11 @@ which xmind || npm install -g "$(find ~/.claude /mnt/skills -name 'xmind-cli-*.t
 xmind auth status
 ```
 
-If unauthenticated, run `xmind auth login` or `xmind auth token <value>`.
+Choose the auth region before logging in: an explicit user choice takes
+precedence; otherwise, if the user communicates in Chinese, use `cn`, and use
+`global` for other languages. If unauthenticated, run `xmind auth login cn` or
+`xmind auth login global` accordingly. The CLI requires this region argument;
+tokens require the same choice: `xmind auth token <value> <cn|global>`.
 File commands require login.
 
 ## Core Boundary