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-rw-r--r--synapse/rest/client/v2_alpha/register.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/rest/client/v2_alpha/register.py b/synapse/rest/client/v2_alpha/register.py
index b3d918080d..9e2f7308ce 100644
--- a/synapse/rest/client/v2_alpha/register.py
+++ b/synapse/rest/client/v2_alpha/register.py
@@ -225,7 +225,10 @@ class RegisterRestServlet(RestServlet):
             # fallback to 'username' if they gave one.
             desired_username = body.get("user", desired_username)
 
-            # XXX we should check that desired_username is valid
+            # XXX we should check that desired_username is valid. Currently
+            # we give appservices carte blanche for any insanity in mxids,
+            # because the IRC bridges rely on being able to register stupid
+            # IDs.
 
             access_token = get_access_token_from_request(request)