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	diff --git a/share/man/man9/hardclock.9 b/share/man/man9/hardclock.9
	--- a/share/man/man9/hardclock.9
	+++ b/share/man/man9/hardclock.9
	@@ -27,7 +27,7 @@
	.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	.\" POSSIBILITY OF SUCH DAMAGE.
	.\"
	-.Dd March 25, 2010
	+.Dd July 1, 2021
	.Dt HARDCLOCK 9
	.Os
	.Sh NAME
	@@ -39,19 +39,26 @@
	.Sh DESCRIPTION
	The
	.Fn hardclock
	-function is called
	-.Xr hz 9
	-times per second.
	-It implements the real-time system clock.
	-The argument
	+function is called periodically based on pending work.
	+The rate ranges from
	+.Va hz
	+times per second on a very busy system, to twice a second on an idle system.
	+The
	.Va cnt
	-is the estimated number of ticks since the last call to
	-.Fn hardclock .
	+argument reports an estimate of the number of ticks since the last call.
	+The sum of
	+.Va cnt
	+over a second averages
	+.Va hz
	+over the long haul.
	+See
	+.Xr hz 9
	+for important details over shorter time scales.
	The argument
	.Va usermode
	is none-zero when
	.Fn hardclock
	-is called from a user-mode context.
	+is called from an context that interrupted usermode execution.
	.Pp
	.Fn hardclock
	may perform different tasks such as:
	@@ -96,5 +103,4 @@
	.Xr ntp_adjtime 2 ,
	.Xr signal 3 ,
	.Xr ntpd 8 ,
	-.Xr callout 9 ,
	.Xr hz 9