1 files changed, 1 insertions, 0 deletions

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

index 2b049debf3..a4155aebae 100644
--- a/synapse/api/errors.py
+++ b/synapse/api/errors.py
@@ -34,6 +34,7 @@ class Codes(object):
     LIMIT_EXCEEDED = "M_LIMIT_EXCEEDED"
     CAPTCHA_NEEDED = "M_CAPTCHA_NEEDED"
     CAPTCHA_INVALID = "M_CAPTCHA_INVALID"
+    MISSING_PARAM = "M_MISSING_PARAM",
     TOO_LARGE = "M_TOO_LARGE"