diff --git a/share/man/man9/mutex.9 b/share/man/man9/mutex.9
index 4d4ae48e8166..2d8c5b7e8793 100644
--- a/share/man/man9/mutex.9
+++ b/share/man/man9/mutex.9
@@ -1,4 +1,4 @@
-.\"	$NetBSD: mutex.9,v 1.25 2012/07/07 21:27:56 rmind Exp $
+.\"	$NetBSD: mutex.9,v 1.26 2013/09/04 10:17:58 skrll Exp $
 .\"
 .\" Copyright (c) 2007, 2009 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -27,7 +27,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd July 7, 2012
+.Dd September 4, 2013
 .Dt MUTEX 9
 .Os
 .Sh NAME
@@ -195,7 +195,7 @@ Equivalent to
 but may only be used when it is known that
 .Ar mtx
 is a spin mutex.
-On some architectures, this can substantially reduce the cost of acquring
+On some architectures, this can substantially reduce the cost of acquiring
 a spin mutex.
 .It Fn mutex_spin_exit "mtx"
 .Pp