diff --git a/changelogs/application_service/newsfragments/1305.clarification b/changelogs/application_service/newsfragments/1305.clarification
index c9a3e755..9c45483f 100644
--- a/changelogs/application_service/newsfragments/1305.clarification
+++ b/changelogs/application_service/newsfragments/1305.clarification
@@ -1 +1 @@
-Clarify that application services can only register an interest in local users.
\ No newline at end of file
+Clarify that application services can only register an interest in local users, as per [MSC3905](https://github.com/matrix-org/matrix-spec-proposals/issues/3905).
\ No newline at end of file