diff --git a/mutex.md b/mutex.md
index 334fc45..e772b78 100644
--- a/mutex.md
+++ b/mutex.md
@@ -4,7 +4,7 @@
 
 ## History
 
-Block profiling was [implemented](https://go-review.googlesource.com/c/go/+/29650/) by [Peter J. Weinberger](https://en.wikipedia.org/wiki/Peter_J._Weinberger) and first appeared in the [go1.8](https://golang.org/doc/go1.8#mutex_prof) release (2017-02-16).
+Mutex profiling was [implemented](https://go-review.googlesource.com/c/go/+/29650/) by [Peter J. Weinberger](https://en.wikipedia.org/wiki/Peter_J._Weinberger) and first appeared in the [go1.8](https://golang.org/doc/go1.8#mutex_prof) release (2017-02-16).
 
 ## Links