diff --git a/share/man/man4/isa.4 b/share/man/man4/isa.4
index f5d45983bbd5..cb9939804e1c 100644
--- a/share/man/man4/isa.4
+++ b/share/man/man4/isa.4
@@ -1,4 +1,4 @@
-.\"	$NetBSD: isa.4,v 1.48 2021/03/11 16:50:08 nia Exp $
+.\"	$NetBSD: isa.4,v 1.49 2021/03/11 18:16:50 nia Exp $
 .\"
 .\" Copyright (c) 1997 Jason R. Thorpe.  All rights reserved.
 .\" Copyright (c) 1997 Jonathan Stone
@@ -134,7 +134,7 @@ Boca BB100[48] and BB2016 multiplexing serial communications cards.
 NS8250-, NS16450-, and NS16550-based serial ports.
 .It Xr cy 4
 Cyclades Cyclom-4Y, -8Y, and -16Y asynchronous serial communications cards.
-.It ioat
+.It Xr ioat 4
 .Tn BOCA Research
 IOAT66
 serial interfaces.