diff --git a/docs/sw.js b/docs/sw.js
index 182ebca..8254768 100644
--- a/docs/sw.js
+++ b/docs/sw.js
@@ -1,15 +1,19 @@
-const log = (...a) => console.log("[SW]", ...a);
+const V = "1";
+const send = (a) => self.clients.matchAll({ type: "window", includeUncontrolled: true }).then((cs) => cs.forEach((c) => c.postMessage(a)));
 self.addEventListener("install", (e) => {
-  log("install");
   self.skipWaiting();
 });
 self.addEventListener("activate", (e) => {
-  log("activate");
-  e.waitUntil(self.clients.claim());
+  e.waitUntil((async () => {
+    await self.clients.claim();
+    await send({ type: "SW_ACTIVE", v: V, ts: Date.now() });
+  })());
 });
 self.addEventListener("fetch", (e) => {
-  if (e.request.mode === "navigate") log("navigate", e.request.url);
+  if (e.request.mode === "navigate") send({ type: "SW_NAVIGATE", url: e.request.url, ts: Date.now() });
 });
 self.addEventListener("message", (e) => {
-  log("message", e.data);
+  if (e.data && e.data.type === "PING") {
+    (e.source || null)?.postMessage({ type: "PONG", v: V, ts: Date.now() }) || send({ type: "PONG", v: V, ts: Date.now() });
+  } else send({ type: "SW_MESSAGE", data: e.data, ts: Date.now() });
 });