diff --git a/docs/index.bs b/docs/index.bs
index 49e65c83..fb1612b6 100644
--- a/docs/index.bs
+++ b/docs/index.bs
@@ -88,6 +88,8 @@ spec: html; urlPrefix: https://html.spec.whatwg.org/multipage/
             text: delay the load event; for: document; url: delay-the-load-event
         urlPrefix: origin.html
             text: creating a policy container from a fetch response
+        urlPrefix: workers.html
+            text: active needed worker
         urlPrefix: webappapis.html
             text: module map; url: module-map
             text: resolve a module specifier; url: resolve-a-module-specifier
@@ -280,6 +282,14 @@ spec: rfc7231; urlPrefix: https://tools.ietf.org/html/rfc7231
     A <dfn export id="dfn-sharedworker-client">shared worker client</dfn> is a [=/service worker client=] whose [=environment settings object/global object=] is a {{SharedWorkerGlobalScope}} object.
 
     A <dfn export id="dfn-worker-client">worker client</dfn> is either a <a>dedicated worker client</a> or a <a>shared worker client</a>.
+
+    A [=/service worker client=] is said to be a <dfn>fully active client</dfn> if either of the following is true:
+      * It is a [=window client=] whose [=responsible document=] is [=fully active=].
+      * It is a [=worker client=] that is an [=active needed worker=].
+
+    To <dfn>discard a client</dfn>, given a [=/service worker client=] |client|, run the following steps:
+      1. If |client| is a [=window client=], then [=discard a document|discard=] its [=responsible document=].
+      2. Else if |client| is a [=worker client=], then [=terminate a worker|terminate=] it.
   </section>
 
   <section>
@@ -1337,6 +1347,7 @@ spec: rfc7231; urlPrefix: https://tools.ietf.org/html/rfc7231
         1. Run these substeps <a>in parallel</a>:
             1. For each [=/service worker client=] |client| whose [=service worker client/origin=] is the <a lt="same origin">same</a> as the associated [=ServiceWorkerGlobalScope/service worker=]'s [=environment settings object/origin=]:
                 1. If |client|'s [=environment/id=] is not |id|, [=continue=].
+                1. If |client| is not a [=fully active client=], [=break=].
                 1. Wait for either |client|'s [=environment/execution ready flag=] to be set or for |client|'s [=discarded flag=] to be set.
                 1. If |client|'s [=environment/execution ready flag=] is set, then invoke [=Resolve Get Client Promise=] with |client| and |promise|, and abort these steps.
             1. Resolve |promise| with undefined.
@@ -1353,6 +1364,7 @@ spec: rfc7231; urlPrefix: https://tools.ietf.org/html/rfc7231
             1. Let |targetClients| be a new [=list=].
             1. For each [=/service worker client=] |client| whose [=service worker client/origin=] is the [=same origin|same=] as the associated [=ServiceWorkerGlobalScope/service worker=]'s [=environment settings object/origin=]:
                 1. If |client|'s [=environment/execution ready flag=] is unset or |client|'s [=discarded flag=] is set, [=continue=].
+                1. If |client| is not a [=fully active client=], [=continue=].
                 1. If |client| is not a [=secure context=], [=continue=].
                 1. If |options|["{{ClientQueryOptions/includeUncontrolled}}"] is false, and if |client|'s [=active service worker=] is not the associated [=ServiceWorkerGlobalScope/service worker=], [=continue=].
                 1. Add |client| to |targetClients|.
@@ -1435,6 +1447,7 @@ spec: rfc7231; urlPrefix: https://tools.ietf.org/html/rfc7231
         1. Run the following substeps <a>in parallel</a>:
             1. For each [=/service worker client=] |client| whose [=service worker client/origin=] is the <a lt="same origin">same</a> as the [=ServiceWorkerGlobalScope/service worker=]'s [=environment settings object/origin=]:
                 1. If |client|'s [=environment/execution ready flag=] is unset or |client|'s [=discarded flag=] is set, [=continue=].
+                1. If |client| is not a [=fully active client=], [=discard a client|discard=] it and [=continue=].
                 1. If |client| is not a [=secure context=], [=continue=].
                 1. Let |registration| be the result of running <a>Match Service Worker Registration</a> algorithm passing |client|'s <a>creation URL</a> as the argument.
                 1. If |registration| is not the [=ServiceWorkerGlobalScope/service worker=]'s <a>containing service worker registration</a>, [=continue=].