diff --git a/docs/sw.js b/docs/sw.js
index 8d4f8d2..a5dd3a5 100644
--- a/docs/sw.js
+++ b/docs/sw.js
@@ -1,3 +1,8 @@
+addEventListener('activate', event => {
+  console.log('activate!')
+  event.waitUntil(clients.claim())
+})
+
 importScripts(
   'https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@latest/lib/wasm_exec/wasm_exec.js',
   'https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@latest/index.js',
diff --git a/index.js b/index.js
index ae94ca1..991986f 100644
--- a/index.js
+++ b/index.js
@@ -1,7 +1,3 @@
-addEventListener('activate', event => {
-  event.waitUntil(clients.claim())
-})
-
 let nextHandlerId = 1
 const handlerResolvers = {}