1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 49c4b85054..e3f086f1c3 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -94,6 +94,8 @@ class EventTypes(object):
     ServerACL = "m.room.server_acl"
     Pinned = "m.room.pinned_events"
 
+    Retention = "m.room.retention"
+
 
 class RejectedReason(object):
     AUTH_ERROR = "auth_error"