diff --git a/LearnConcurrency.md b/LearnConcurrency.md
index bc1a23aa..e1cd6927 100644
--- a/LearnConcurrency.md
+++ b/LearnConcurrency.md
@@ -10,6 +10,7 @@ This page links to resources for learning about concurrency in Go.  The items ar
     - [Select statements](https://golang.org/ref/spec#Select_statements)
 - Code [A Tour of Go: Concurrency](http://tour.golang.org/concurrency/1)
 - Read [Fundamentals of Concurrency](https://www.nada.kth.se/~snilsson/concurrency/)
+- Read [Mutexes and Semaphores Demystified](http://www.barrgroup.com/Embedded-Systems/How-To/RTOS-Mutex-Semaphore)
 - Read the [Frequently Asked Questions (FAQ)](http://golang.org/doc/faq), especially
     - [Why build concurrency on the ideas of CSP?](http://golang.org/doc/faq#csp)
     - [Why goroutines instead of threads?](http://golang.org/doc/faq#goroutines)