diff --git a/share/man/man4/man4.i386/psm.4 b/share/man/man4/man4.i386/psm.4
index 4797bab3997d..db7a5a8c9f35 100644
--- a/share/man/man4/man4.i386/psm.4
+++ b/share/man/man4/man4.i386/psm.4
@@ -24,7 +24,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $Id: psm.4,v 1.7 1997/02/22 13:25:39 peter Exp $
+.\" $Id: psm.4,v 1.10 1997/12/07 08:46:54 yokota Exp $
 .\"
 .Dd December 3, 1997
 .Dt PSM 4 i386
@@ -282,7 +282,12 @@ the bit pattern of that byte. Although this method should work with most
 PS/2 pointing devices, it may interfere with some devices which are not
 so compatible with known devices.
 If you think your pointing device is not functioning as expected, 
-see if disabling synchronization check will help by setting this flag.
+and the kernel frequently prints the following message to the console,
+.Bd -literal -offset indent
+psmintr: out of sync (xxxx != yyyy).
+.Ed
+.Pp
+set this flag to disable synchronization check and see if it helps.
 .El
 .Sh IOCTLS
 There are a few 
diff --git a/share/man/man4/psm.4 b/share/man/man4/psm.4
index 4797bab3997d..db7a5a8c9f35 100644
--- a/share/man/man4/psm.4
+++ b/share/man/man4/psm.4
@@ -24,7 +24,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $Id: psm.4,v 1.7 1997/02/22 13:25:39 peter Exp $
+.\" $Id: psm.4,v 1.10 1997/12/07 08:46:54 yokota Exp $
 .\"
 .Dd December 3, 1997
 .Dt PSM 4 i386
@@ -282,7 +282,12 @@ the bit pattern of that byte. Although this method should work with most
 PS/2 pointing devices, it may interfere with some devices which are not
 so compatible with known devices.
 If you think your pointing device is not functioning as expected, 
-see if disabling synchronization check will help by setting this flag.
+and the kernel frequently prints the following message to the console,
+.Bd -literal -offset indent
+psmintr: out of sync (xxxx != yyyy).
+.Ed
+.Pp
+set this flag to disable synchronization check and see if it helps.
 .El
 .Sh IOCTLS
 There are a few