diff --git a/README.md b/README.md
index 5ec339701..448351fdd 100644
--- a/README.md
+++ b/README.md
@@ -757,6 +757,7 @@ pip install -e ".[weixin]"
 
 > - `allowFrom`: Add the sender ID you see in nanobot logs for your WeChat account. Use `["*"]` to allow all users.
 > - `token`: Optional. If omitted, log in interactively and nanobot will save the token for you.
+> - `routeTag`: Optional. When your upstream Weixin deployment requires request routing, nanobot will send it as the `SKRouteTag` header.
 > - `stateDir`: Optional. Defaults to nanobot's runtime directory for Weixin state.
 > - `pollTimeout`: Optional long-poll timeout in seconds.
 
diff --git a/nanobot/channels/weixin.py b/nanobot/channels/weixin.py
index 2e25b3569..3fbe329aa 100644
--- a/nanobot/channels/weixin.py
+++ b/nanobot/channels/weixin.py
@@ -4,7 +4,7 @@ Uses the ilinkai.weixin.qq.com API for personal WeChat messaging.
 No WebSocket, no local WeChat client needed — just HTTP requests with a
 bot token obtained via QR code login.
 
-Protocol reverse-engineered from ``@tencent-weixin/openclaw-weixin`` v1.0.2.
+Protocol reverse-engineered from ``@tencent-weixin/openclaw-weixin`` v1.0.3.
 """
 
 from __future__ import annotations
@@ -799,7 +799,7 @@ class WeixinChannel(BaseChannel):
     ) -> None:
         """Upload a local file to WeChat CDN and send it as a media message.
 
-        Follows the exact protocol from ``@tencent-weixin/openclaw-weixin`` v1.0.2:
+        Follows the exact protocol from ``@tencent-weixin/openclaw-weixin`` v1.0.3:
         1. Generate a random 16-byte AES key (client-side).
         2. Call ``getuploadurl`` with file metadata + hex-encoded AES key.
         3. AES-128-ECB encrypt the file and POST to CDN (``{cdnBaseUrl}/upload``).