diff --git a/SUMMARY.md b/SUMMARY.md
index bcb7f0d..c67a45c 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -75,6 +75,7 @@
     * 3.4 熔断
         * 3.4.1 如何进行熔断？
         * 3.4.2 熔断框架都有哪些？具体实现原理知道吗？
+        * [3.4.3 如何做技术选型？选用 Sentinel 还是 Hystrix？](/docs/high-availability/sentinel-vs-hystrix.md)
     * 3.5 降级
         * 3.5.1 如何进行降级？
 * Part4 微服务架构
diff --git a/docs/from-readers/README.md b/docs/from-readers/README.md
index a324369..893ae69 100644
--- a/docs/from-readers/README.md
+++ b/docs/from-readers/README.md
@@ -10,6 +10,6 @@ This project exists thanks to all the people who contribute.
 
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
 
-<a href="https://github.com/doocs/leetcode/graphs/contributors"><img src="https://opencollective.com/advanced-java/contributors.svg?width=890&button=false" /></a>
+<a href="https://github.com/doocs/advanced-java/graphs/contributors"><img src="https://opencollective.com/advanced-java/contributors.svg?width=890&button=false" /></a>
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->
\ No newline at end of file
diff --git a/sw.js b/sw.js
deleted file mode 100644
index cf6295c..0000000
--- a/sw.js
+++ /dev/null
@@ -1,83 +0,0 @@
-/* ===========================================================
- * docsify sw.js
- * ===========================================================
- * Copyright 2016 @huxpro
- * Licensed under Apache 2.0
- * Register service worker.
- * ========================================================== */
-
-const RUNTIME = 'docsify'
-const HOSTNAME_WHITELIST = [
-  self.location.hostname,
-  'fonts.gstatic.com',
-  'fonts.googleapis.com',
-  'unpkg.com'
-]
-
-// The Util Function to hack URLs of intercepted requests
-const getFixedUrl = (req) => {
-  var now = Date.now()
-  var url = new URL(req.url)
-
-  // 1. fixed http URL
-  // Just keep syncing with location.protocol
-  // fetch(httpURL) belongs to active mixed content.
-  // And fetch(httpRequest) is not supported yet.
-  url.protocol = self.location.protocol
-
-  // 2. add query for caching-busting.
-  // Github Pages served with Cache-Control: max-age=600
-  // max-age on mutable content is error-prone, with SW life of bugs can even extend.
-  // Until cache mode of Fetch API landed, we have to workaround cache-busting with query string.
-  // Cache-Control-Bug: https://bugs.chromium.org/p/chromium/issues/detail?id=453190
-  if (url.hostname === self.location.hostname) {
-    url.search += (url.search ? '&' : '?') + 'cache-bust=' + now
-  }
-  return url.href
-}
-
-/**
- *  @Lifecycle Activate
- *  New one activated when old isnt being used.
- *
- *  waitUntil(): activating ====> activated
- */
-self.addEventListener('activate', event => {
-  event.waitUntil(self.clients.claim())
-})
-
-/**
- *  @Functional Fetch
- *  All network requests are being intercepted here.
- *
- *  void respondWith(Promise<Response> r)
- */
-self.addEventListener('fetch', event => {
-  // Skip some of cross-origin requests, like those for Google Analytics.
-  if (HOSTNAME_WHITELIST.indexOf(new URL(event.request.url).hostname) > -1) {
-    // Stale-while-revalidate
-    // similar to HTTP's stale-while-revalidate: https://www.mnot.net/blog/2007/12/12/stale
-    // Upgrade from Jake's to Surma's: https://gist.github.com/surma/eb441223daaedf880801ad80006389f1
-    const cached = caches.match(event.request)
-    const fixedUrl = getFixedUrl(event.request)
-    const fetched = fetch(fixedUrl, { cache: 'no-store' })
-    const fetchedCopy = fetched.then(resp => resp.clone())
-
-    // Call respondWith() with whatever we get first.
-    // If the fetch fails (e.g disconnected), wait for the cache.
-    // If there’s nothing in cache, wait for the fetch.
-    // If neither yields a response, return offline pages.
-    event.respondWith(
-      Promise.race([fetched.catch(_ => cached), cached])
-        .then(resp => resp || fetched)
-        .catch(_ => { /* eat any errors */ })
-    )
-
-    // Update the cache with the version we fetched (only for ok status)
-    event.waitUntil(
-      Promise.all([fetchedCopy, caches.open(RUNTIME)])
-        .then(([response, cache]) => response.ok && cache.put(event.request, response))
-        .catch(_ => { /* eat any errors */ })
-    )
-  }
-})
\ No newline at end of file