1 files changed, 5 insertions, 2 deletions
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 30bebd749f..6b347b1749 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -23,6 +23,9 @@ MAX_DEPTH = 2**63 - 1
 # the maximum length for a room alias is 255 characters
 MAX_ALIAS_LENGTH = 255
 
+# the maximum length for a user id is 255 characters
+MAX_USERID_LENGTH = 255
+
 
 class Membership(object):
 
@@ -122,5 +125,5 @@ class RelationTypes(object):
     """The types of relations known to this server.
     """
     ANNOTATION = "m.annotation"
-    REPLACES = "m.replaces"
-    REFERENCES = "m.references"
+    REPLACE = "m.replace"
+    REFERENCE = "m.reference"