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diff --git a/deps/v8/tools/inspect-d8.js b/deps/v8/tools/inspect-d8.js
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+++ b/deps/v8/tools/inspect-d8.js
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+// Copyright 2019 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This helper allows to debug d8 using Chrome DevTools.
+//
+// It runs a simple REPL for inspector messages and relies on
+// websocketd (https://github.com/joewalnes/websocketd) for the WebSocket
+// communication.
+//
+// You can start a session with a debug build of d8 like:
+//
+// $ websocketd out/x64.debug/d8 YOUR_SCRIPT.js tools/inspect-d8.js
+//
+// After that, copy the URL from console and pass it as `ws=` parameter to
+// the Chrome DevTools frontend like:
+//
+// chrome-devtools://devtools/bundled/js_app.html?ws=localhost:80
+
+function receive(msg) {
+  print(msg);
+}
+
+function handleInspectorMessage() {
+  send(readline());
+}
+
+while (true) {
+  handleInspectorMessage();
+}