Index: head/usr.sbin/pwm/pwm.8
===================================================================
--- head/usr.sbin/pwm/pwm.8	(revision 349166)
+++ head/usr.sbin/pwm/pwm.8	(revision 349167)
@@ -1,122 +1,122 @@
 .\" Copyright (c) 2018 Emmanuel Vadot <manu@freebsd.org>
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
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 .\" 2. Redistributions in binary form must reproduce the above copyright
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 .\"
 .\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
 .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 .\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
 .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
 .\" $FreeBSD$
 .\"
 .Dd June 17, 2019
 .Dt PWM 8
 .Os
 .Sh NAME
 .Nm pwm
 .Nd configure PWM (Pulse Width Modulation) hardware
 .Sh SYNOPSIS
 .Nm
 .Op Fl f Ar device
 .Fl C
 .Nm
 .Op Fl f Ar device
 .Op Fl D | Fl E
 .Op Fl p Ar period
 .Op Fl d Ar duty
 .Sh DESCRIPTION
 The
 .Nm
 utility can be used to configure pwm hardware.
 .Nm
 uses a
 .Xr pwmc 4
 device to communicate with the hardware.
 Some PWM hardware supports multiple output channels within a single
 controller block; each
 .Xr pwmc 4
 instance controls a single PWM channel.
 .Pp
 .Xr pwmc 4
 devices are named
 .Pa /dev/pwm/pwmcX.Y ,
 where
 .Va X
 is the controller unit number and
 .Va Y
 is the channel number within that unit.
 .Pp
 The options are as follows:
 .Bl -tag -width "-f device"
 .It Fl f Ar device
 Device to operate on.
 If not specified,
 .Pa /dev/pwm/pwmc0.0
 is used.
 If an unqualified name is provided,
 .Pa /dev/pwm
 is automatically prepended.
 .It Fl C
 Show the configuration of the PWM channel.
 .It Fl D
 Disable the PWM channel.
 .It Fl d Ar duty
-Configure the duty (in nanoseconds or percentage) of the PWM channel.
+Configure the duty cycle (in nanoseconds or percentage) of the PWM channel.
 Duty is the portion of the
 .Ar period
 during which the signal is asserted.
 .It Fl E
 Enable the PWM channel.
 .It Fl p Ar period
 Configure the period (in nanoseconds) of the PWM channel.
 .El
 .Sh EXAMPLES
 .Bl -bullet
 .It
 Show the configuration of the PWM channel:
 .Bd -literal
 pwm -f /dev/pwm/pwmc0.1 -C
 .Ed
 .It
 Configure a 50000 ns period and a 25000 ns duty cycle
 and enable the channel:
 .Bd -literal
 pwm -f pwmc1.1 -E -p 50000 -d 25000
 .Ed
 .It
 Configure a 50% duty cycle on the device and channel which
 were configured in
 .Xr pwmc 4
 to have the label
 .Pa backlight :
 .Bd -literal
 pwm -f backlight -d 50%
 .Ed
 .El
 .Sh SEE ALSO
 .Xr pwm 9 ,
 .Xr pwmbus 9
 .Sh HISTORY
 The
 .Nm
 utility appeared in
 .Fx 13.0 .
 .Sh AUTHORS
 .An -nosplit
 The
 .Nm
 utility and this manual page were written by
 .An Emmanuel Vadot Aq Mt manu@FreeBSD.org .