1 files changed, 9 insertions, 0 deletions
diff --git a/synapse/config/user_directory.py b/synapse/config/user_directory.py
index 38e8947843..9b0ae91289 100644
--- a/synapse/config/user_directory.py
+++ b/synapse/config/user_directory.py
@@ -23,11 +23,15 @@ class UserDirectoryConfig(Config):
 
     def read_config(self, config):
         self.user_directory_search_all_users = False
+        self.user_directory_defer_to_id_server = None
         user_directory_config = config.get("user_directory", None)
         if user_directory_config:
             self.user_directory_search_all_users = (
                 user_directory_config.get("search_all_users", False)
             )
+            self.user_directory_defer_to_id_server = (
+                user_directory_config.get("defer_to_id_server", None)
+            )
 
     def default_config(self, config_dir_path, server_name, **kwargs):
         return """
@@ -41,4 +45,9 @@ class UserDirectoryConfig(Config):
         #
         #user_directory:
         #   search_all_users: false
+        #
+        #   If this is set, user search will be delegated to this ID server instead
+        #   of synapse performing the search itself.
+        #   This is an experimental API.
+        #   defer_to_id_server: id.example.com
         """