1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index ca13843680..6c3958f7ab 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -65,6 +65,12 @@ class JoinRules:
     MSC3083_RESTRICTED = "restricted"
 
 
+class RestrictedJoinRuleTypes:
+    """Understood types for the allow rules in restricted join rules."""
+
+    ROOM_MEMBERSHIP = "m.room_membership"
+
+
 class LoginType:
     PASSWORD = "m.login.password"
     EMAIL_IDENTITY = "m.login.email.identity"