From f2716de93f755f4d39f8d9e4d74f2d77a62854fc Mon Sep 17 00:00:00 2001
From: Andy Huang <45963921+asd153866714@users.noreply.github.com>
Date: Thu, 15 Jun 2023 22:25:15 +0800
Subject: [PATCH] Update free-courses-en.md (#9396)

---
 courses/free-courses-en.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/courses/free-courses-en.md b/courses/free-courses-en.md
index b097e78c5..07c7682bd 100644
--- a/courses/free-courses-en.md
+++ b/courses/free-courses-en.md
@@ -1115,6 +1115,7 @@
 
 * [Berkeley's CS 162: Operating Systems and Systems Programming](https://www.youtube.com/watch?v=feAOZuID1HM)
 * [Berkeley's CS 194: What is an Operating System?](http://www.infocobuild.com/education/audio-video-courses/computer-science/cs194-spring2013-berkeley.html)
+* [MIT 6.S081: Operating System Engineering(Fall 2020)](https://pdos.csail.mit.edu/6.S081/2020/schedule.html) - Frans Kaashoek, Robert Morris
 * [Operating System](https://www.youtube.com/playlist?list=PLBlnK6fEyqRiVhbXDGLXDk_OQAeuVcp2O) - Neso Academy