diff --git a/docs/admin_api/shutdown_room.md b/docs/admin_api/shutdown_room.md
index 54ce1cd234..9b1cb1c184 100644
--- a/docs/admin_api/shutdown_room.md
+++ b/docs/admin_api/shutdown_room.md
@@ -10,6 +10,8 @@ disallow any further invites or joins.
The local server will only have the power to move local user and room aliases to
the new room. Users on other servers will be unaffected.
+See also: [Delete Room API](rooms.md#delete-room-api)
+
## API
You will need to authenticate with an access token for an admin user.
@@ -31,7 +33,7 @@ You will need to authenticate with an access token for an admin user.
* `message` - Optional. A string containing the first message that will be sent as
`new_room_user_id` in the new room. Ideally this will clearly convey why the
original room was shut down.
-
+
If not specified, the default value of `room_name` is "Content Violation
Notification". The default value of `message` is "Sharing illegal content on
othis server is not permitted and rooms in violation will be blocked."
@@ -70,3 +72,30 @@ Response:
"new_room_id": "!newroomid:example.com",
},
```
+
+## Undoing room shutdowns
+
+*Note*: This guide may be outdated by the time you read it. By nature of room shutdowns being performed at the database level,
+the structure can and does change without notice.
+
+First, it's important to understand that a room shutdown is very destructive. Undoing a shutdown is not as simple as pretending it
+never happened - work has to be done to move forward instead of resetting the past. In fact, in some cases it might not be possible
+to recover at all:
+
+* If the room was invite-only, your users will need to be re-invited.
+* If the room no longer has any members at all, it'll be impossible to rejoin.
+* The first user to rejoin will have to do so via an alias on a different server.
+
+With all that being said, if you still want to try and recover the room:
+
+1. For safety reasons, shut down Synapse.
+2. In the database, run `DELETE FROM blocked_rooms WHERE room_id = '!example:example.org';`
+ * For caution: it's recommended to run this in a transaction: `BEGIN; DELETE ...;`, verify you got 1 result, then `COMMIT;`.
+ * The room ID is the same one supplied to the shutdown room API, not the Content Violation room.
+3. Restart Synapse.
+
+You will have to manually handle, if you so choose, the following:
+
+* Aliases that would have been redirected to the Content Violation room.
+* Users that would have been booted from the room (and will have been force-joined to the Content Violation room).
+* Removal of the Content Violation room if desired.
|
