diff --git a/share/man/man4/man4.i386/sio.4 b/share/man/man4/man4.i386/sio.4
index d1ce9ddc9095..0e8957a73594 100644
--- a/share/man/man4/man4.i386/sio.4
+++ b/share/man/man4/man4.i386/sio.4
@@ -34,7 +34,7 @@
 .\"
 .\"     from: @(#)dca.4	5.2 (Berkeley) 3/27/91
 .\"	from: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp
-.\"	$Id: sio.4,v 1.10 1994/05/07 01:15:10 ache Exp $
+.\"	$Id: sio.4,v 1.12 1994/06/04 00:41:25 ache Exp $
 .\"
 .Dd June 3, 1994
 .Dt SIO 4 i386
@@ -71,7 +71,7 @@ Meaning of \fBflags\fR:
 .br
 \fB0x0004\fR no AST/4 compatible IRQ control register
 .br
-\fB0x0080\fR disable diagnostics in probe
+\fB0x0080\fR enable diagnostics in probe
 .br
 \fB0x\fI??\fB00\fR minor number of master port
 .sp
diff --git a/share/man/man4/sio.4 b/share/man/man4/sio.4
index d1ce9ddc9095..0e8957a73594 100644
--- a/share/man/man4/sio.4
+++ b/share/man/man4/sio.4
@@ -34,7 +34,7 @@
 .\"
 .\"     from: @(#)dca.4	5.2 (Berkeley) 3/27/91
 .\"	from: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp
-.\"	$Id: sio.4,v 1.10 1994/05/07 01:15:10 ache Exp $
+.\"	$Id: sio.4,v 1.12 1994/06/04 00:41:25 ache Exp $
 .\"
 .Dd June 3, 1994
 .Dt SIO 4 i386
@@ -71,7 +71,7 @@ Meaning of \fBflags\fR:
 .br
 \fB0x0004\fR no AST/4 compatible IRQ control register
 .br
-\fB0x0080\fR disable diagnostics in probe
+\fB0x0080\fR enable diagnostics in probe
 .br
 \fB0x\fI??\fB00\fR minor number of master port
 .sp