1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/http/client.py b/synapse/http/client.py
index 5f4558be47..fee8c901a2 100644
--- a/synapse/http/client.py
+++ b/synapse/http/client.py
@@ -113,6 +113,9 @@ class SimpleHttpClient(object):
         if 200 <= response.code < 300:
             defer.returnValue(json.loads(body))
         else:
+            # NB: This is explicitly not json.loads(body)'d because the contract
+            # of CodeMessageException is a *string* message. Callers can always
+            # load it into JSON if they want.
             raise CodeMessageException(response.code, body)