1 files changed, 21 insertions, 0 deletions
diff --git a/synapse/config/server.py b/synapse/config/server.py
index 38de4b8000..b3a9e50752 100644
--- a/synapse/config/server.py
+++ b/synapse/config/server.py
@@ -680,6 +680,18 @@ class ServerConfig(Config):
             config.get("use_account_validity_in_account_status") or False
         )
 
+        # This is a temporary option that enables fully using the new
+        # `device_lists_changes_in_room` without the backwards compat code. This
+        # is primarily for testing. If enabled the server should *not* be
+        # downgraded, as it may lead to missing device list updates.
+        self.use_new_device_lists_changes_in_room = (
+            config.get("use_new_device_lists_changes_in_room") or False
+        )
+
+        self.rooms_to_exclude_from_sync: List[str] = (
+            config.get("exclude_rooms_from_sync") or []
+        )
+
     def has_tls_listener(self) -> bool:
         return any(listener.tls for listener in self.listeners)
 
@@ -1234,6 +1246,15 @@ class ServerConfig(Config):
           # information about using custom templates.
           #
           #custom_template_directory: /path/to/custom/templates/
+
+        # List of rooms to exclude from sync responses. This is useful for server
+        # administrators wishing to group users into a room without these users being able
+        # to see it from their client.
+        #
+        # By default, no room is excluded.
+        #
+        #exclude_rooms_from_sync:
+        #    - !foo:example.com
         """
             % locals()
         )