diff --git a/proposals/2140-terms-of-service-2.md b/proposals/2140-terms-of-service-2.md
index a483607b..b508a9e2 100644
--- a/proposals/2140-terms-of-service-2.md
+++ b/proposals/2140-terms-of-service-2.md
@@ -54,7 +54,7 @@ and adds authentication to accross the Identity Service API.
 ### IS API Authentication
 
 All current endpoints within `/_matrix/identity/api/v1/` will be duplicated
-into `/_matrix/identity/v2`.
+into `/_matrix/identity/v2`, noting that MSC2134 changes the behaviour of lookups. Authentication is still expected on MSC2134's proposed endpoints.
 
 Any request to any endpoint within `/_matrix/identity/v2`, with the exception
 of `/_matrix/identity/v2` and the new `/_matrix/identity/v2/account/register`