2 files changed, 4 insertions, 1 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 960e66dbdc..0c6c93a87b 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -556,7 +556,7 @@ class Auth(object):
         """ Check if the given user is a local server admin.
 
         Args:
-            user (str): mxid of user to check
+            user (UserID): user to check
 
         Returns:
             bool: True if the user is an admin
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 0860b75905..8547a63535 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -20,6 +20,9 @@
 # the "depth" field on events is limited to 2**63 - 1
 MAX_DEPTH = 2**63 - 1
 
+# the maximum length for a room alias is 255 characters
+MAX_ALIAS_LENGTH = 255
+
 
 class Membership(object):