diff --git a/concurrency/cmd/mutex/main.go b/concurrency/cmd/mutex/main.go
index 3534b6c..67282a9 100644
--- a/concurrency/cmd/mutex/main.go
+++ b/concurrency/cmd/mutex/main.go
@@ -27,6 +27,7 @@ func main() {
 	wg.Add(len(adjustments))
 
 	for _, adjustment := range adjustments {
+		// go = placed onto thread, not the stack.
 		go func(adjustment int) {
 			defer wg.Done()