diff --git a/docs/index.bs b/docs/index.bs
index bf094df7..183a4e35 100644
--- a/docs/index.bs
+++ b/docs/index.bs
@@ -3065,6 +3065,8 @@ spec: storage; urlPrefix: https://storage.spec.whatwg.org/
               :: Return |serviceWorker|'s [=service worker/script url=].
               : The [=environment settings object/origin=]
               :: Return its registering [=/service worker client=]'s [=environment settings object/origin=].
+              : The [=environment settings object/has cross-site ancestor=]
+              :: Return its registering [=/service worker client=]'s [=environment settings object/has cross-site ancestor=].
               : The [=environment settings object/policy container=]
               :: Return |workerGlobalScope|'s [=WorkerGlobalScope/policy container=].
               : The [=environment settings object/time origin=]