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diff --git a/docs/admin_api/purge_room.md b/docs/admin_api/purge_room.md
new file mode 100644
index 0000000000..64ea7b6a64
--- /dev/null
+++ b/docs/admin_api/purge_room.md
@@ -0,0 +1,18 @@
+Purge room API
+==============
+
+This API will remove all trace of a room from your database.
+
+All local users must have left the room before it can be removed.
+
+The API is:
+
+```
+POST /_synapse/admin/v1/purge_room
+
+{
+    "room_id": "!room:id"
+}
+```
+
+You must authenticate using the access token of an admin user.
diff --git a/docs/admin_api/user_admin_api.rst b/docs/admin_api/user_admin_api.rst
index 213359d0c0..d0871f9438 100644
--- a/docs/admin_api/user_admin_api.rst
+++ b/docs/admin_api/user_admin_api.rst
@@ -84,3 +84,42 @@ with a body of:
    }
 
 including an ``access_token`` of a server admin.
+
+
+Get whether a user is a server administrator or not
+===================================================
+
+
+The api is::
+
+    GET /_synapse/admin/v1/users/<user_id>/admin
+
+including an ``access_token`` of a server admin.
+
+A response body like the following is returned:
+
+.. code:: json
+
+    {
+        "admin": true
+    }
+
+
+Change whether a user is a server administrator or not
+======================================================
+
+Note that you cannot demote yourself.
+
+The api is::
+
+    PUT /_synapse/admin/v1/users/<user_id>/admin
+
+with a body of:
+
+.. code:: json
+
+    {
+        "admin": true
+    }
+
+including an ``access_token`` of a server admin.