diff --git a/docs/index.bs b/docs/index.bs
index 26acd272..b4af364d 100644
--- a/docs/index.bs
+++ b/docs/index.bs
@@ -302,7 +302,7 @@ spec: webappsec-referrer-policy; urlPrefix: https://w3c.github.io/webappsec-refe
         // event
         attribute EventHandler onstatechange;
       };
-      ServiceWorker implements AbstractWorker;
+      ServiceWorker includes AbstractWorker;
 
       enum ServiceWorkerState {
         "installing",