diff --git a/README.md b/README.md
index 88d2f8d54..37713842e 100644
--- a/README.md
+++ b/README.md
@@ -403,6 +403,7 @@ If you prefer to configure manually, add the following to `~/.nanobot/config.jso
       "enabled": true,
       "token": "YOUR_BOT_TOKEN",
       "allowFrom": ["YOUR_USER_ID"],
+      "allowChannels": [],
       "groupPolicy": "mention",
       "streaming": true
     }
@@ -415,6 +416,7 @@ If you prefer to configure manually, add the following to `~/.nanobot/config.jso
 > - `"open"` — Respond to all messages
 > DMs always respond when the sender is in `allowFrom`.
 > - If you set group policy to open create new threads as private threads and then @ the bot into it. Otherwise the thread itself and the channel in which you spawned it will spawn a bot session.
+> `allowChannels` restricts the bot to specific Discord channel IDs. Empty (default) means respond in every channel the bot can see. Example: `["1234567890", "0987654321"]`. The filter applies after `allowFrom`, so both must pass.
 > `streaming` defaults to `true`. Disable it only if you explicitly want non-streaming replies.
 
 **5. Invite the bot**