diff --git a/README.md b/README.md
index 3bb0163..87d8c57 100644
--- a/README.md
+++ b/README.md
@@ -1098,6 +1098,7 @@ Graphs can be used to represent many problems in computer science, so this secti
         - Context switching
             - How context switching is initiated by the operating system and underlying hardware?
     - [ ] [threads in C++ (series - 10 videos)](https://www.youtube.com/playlist?list=PL5jc9xFGsL8E12so1wlMS0r0hTQoJL74M)
+    - [ ] [CS 377 Spring '14: Operating Systems from University of Massachusetts](https://www.youtube.com/playlist?list=PLacuG5pysFbDQU8kKxbUh4K5c1iL5_k7k)
     - [ ] concurrency in Python (videos):
         - [ ] [Short series on threads](https://www.youtube.com/playlist?list=PL1H1sBF1VAKVMONJWJkmUh6_p8g4F2oy1)
         - [ ] [Python Threads](https://www.youtube.com/watch?v=Bs7vPNbB9JM)