1 files changed, 8 insertions, 0 deletions
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index 9bb3beedbc..f255b58c8a 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -99,6 +99,9 @@ class RegistrationConfig(Config):
 
         self.registrations_require_3pid = config.get("registrations_require_3pid", [])
         self.allowed_local_3pids = config.get("allowed_local_3pids", [])
+        self.check_is_for_allowed_local_3pids = config.get(
+            "check_is_for_allowed_local_3pids", None
+        )
         self.enable_3pid_lookup = config.get("enable_3pid_lookup", True)
         self.registration_shared_secret = config.get("registration_shared_secret")
 
@@ -247,6 +250,11 @@ class RegistrationConfig(Config):
         # Mandate that users are only allowed to associate certain formats of
         # 3PIDs with accounts on this server.
         #
+        # Use an Identity Server to establish which 3PIDs are allowed to register?
+        # Overrides allowed_local_3pids below.
+        #
+        #check_is_for_allowed_local_3pids: matrix.org
+        #
         #allowed_local_3pids:
         #  - medium: email
         #    pattern: '.*@matrix\\.org'