diff --git a/usr.sbin/iostat/iostat.8 b/usr.sbin/iostat/iostat.8
index 7b268d75a00e..198ebd86a435 100644
--- a/usr.sbin/iostat/iostat.8
+++ b/usr.sbin/iostat/iostat.8
@@ -247,8 +247,9 @@ Smaller values will be truncated.
 .Pp
 e.g. -w1.0001 becomes -w1.000
 .Pp
-The interval will also suffer from modifications to hz so your mileage
-may vary.
+The interval will also suffer from modifications to
+.Va kern.hz
+so your mileage may vary.
 .It Fl x
 Show extended disk statistics.
 Each disk is displayed on a line of its own with all available statistics.