Index: share/man/man9/hz.9
===================================================================
--- share/man/man9/hz.9
+++ share/man/man9/hz.9
@@ -36,7 +36,7 @@
 .Pp
 .Vt extern int hz;
 .Vt extern int tick;
-.Vt extern int stathz;	/* deprecated */
+.Vt extern int stathz;
 .Vt extern int profhz;	/* deprecated */
 .Sh DESCRIPTION
 .Fx
@@ -56,12 +56,19 @@
 .Va hz
 times per second.
 .Pp
-The second clock, running at either
-.Va stathz
-or
+The second clock, effectively running at either
+.Va stathz ,
+is used to gather statistics on the system, its processes, etc.
+It computes values for
+.Xr getrusage 2
+and statistics displayed by
+.Xr ps 1
+and
+.Xr top 1 .
+.Pp
+The historical use of
 .Va profhz
-was used to gather timing statistics, but has been replaced with the more
-functional
+to gather timing statistics has been replaced with the more functional
 .Xr hwpmc 4 .
 These values are returned for
 .Qq compatibility
@@ -88,6 +95,15 @@
 from
 .Xr sysctl 8 .
 .Pp
+The current global and per-CPU CPU time usage is returned to the user in units
+of 1 /
+.Va stathz
+ticks in the
+.Sy kern.cp_time
+and
+.Sy kern.cp_times
+sysctl MIBs.
+.Pp
 The
 .Va hz
 rate may be overridden by defining