diff --git a/share/man/man4/sio.4 b/share/man/man4/sio.4
index e6aa5129a2df..fa6432f2f950 100644
--- a/share/man/man4/sio.4
+++ b/share/man/man4/sio.4
@@ -355,7 +355,7 @@ corresponding callout initial-state and lock-state devices
 examples of setting the initial-state and lock-state devices
 .El
 .Pp
-The devices numbers are made from the set [0-9a-v] so that more than
+The device numbers are made from the set [0-9a-v] so that more than
 10 ports can be supported.
 .Sh DIAGNOSTICS
 .Bl -diag