1 files changed, 1 insertions, 0 deletions

diff --git a/synapse/api/errors.py b/synapse/api/errors.py

index 84afe4fa37..8e9dd2aba6 100644
--- a/synapse/api/errors.py
+++ b/synapse/api/errors.py
@@ -29,6 +29,7 @@ class Codes(object):
     NOT_FOUND = "M_NOT_FOUND"
     UNKNOWN_TOKEN = "M_UNKNOWN_TOKEN"
     LIMIT_EXCEEDED = "M_LIMIT_EXCEEDED"
+    NEEDS_CAPTCHA = "M_NEEDS_CAPTCHA"
 
 
 class CodeMessageException(Exception):