diff --git a/docs/gateway/configuration-reference.md b/docs/gateway/configuration-reference.md
index ca0a17f9542..ceba7b19d95 100644
--- a/docs/gateway/configuration-reference.md
+++ b/docs/gateway/configuration-reference.md
@@ -205,6 +205,7 @@ WhatsApp runs through the gateway's web channel (Baileys Web). It starts automat
 
 - Bot token: `channels.telegram.botToken` or `channels.telegram.tokenFile`, with `TELEGRAM_BOT_TOKEN` as fallback for the default account.
 - Optional `channels.telegram.defaultAccount` overrides default account selection when it matches a configured account id.
+- In multi-account setups (2+ account ids), set an explicit default (`channels.telegram.defaultAccount` or `channels.telegram.accounts.default`) to avoid fallback routing; `openclaw doctor` warns when this is missing or invalid.
 - `configWrites: false` blocks Telegram-initiated config writes (supergroup ID migrations, `/config set|unset`).
 - Telegram stream previews use `sendMessage` + `editMessageText` (works in direct and group chats).
 - Retry policy: see [Retry policy](/concepts/retry).