docs: clarify group chat behavior

docs/start/faq.md

@@ -273,6 +273,30 @@ This runs your login shell and imports only missing expected keys (never overrid
 
 Send `/new` or `/reset` as a standalone message. See [Session management](/concepts/session).
 
+### Do I need to add a “bot account” to a WhatsApp group?
+
+No. Clawdbot runs on **your own account**, so if you’re in the group, Clawdbot can see it.
+By default, anyone in that group can **mention** the bot to trigger a reply.
+
+If you want only **you** to be able to trigger group replies:
+
+```json5
+{
+  whatsapp: {
+    groupPolicy: "allowlist",
+    groupAllowFrom: ["+15551234567"]
+  }
+}
+```
+
+### Why doesn’t Clawdbot reply in a group?
+
+Two common causes:
+- Mention gating is on (default). You must @mention the bot (or match `mentionPatterns`).
+- You configured `whatsapp.groups` without `"*"` and the group isn’t allowlisted.
+
+See [Groups](/concepts/groups) and [Group messages](/concepts/group-messages).
+
 ### Do groups/threads share context with DMs?
 
 Direct chats collapse to the main session by default. Groups/channels have their own session keys, and Telegram topics / Discord threads are separate sessions. See [Groups](/concepts/groups) and [Group messages](/concepts/group-messages).