diff --git a/usr.sbin/cron/cron/cron.8 b/usr.sbin/cron/cron/cron.8
index c436cc2d396..ed1af0d0641 100644
--- a/usr.sbin/cron/cron/cron.8
+++ b/usr.sbin/cron/cron/cron.8
@@ -46,18 +46,17 @@ The
 .Nm
 utility searches
 .Pa /var/cron/tabs
-for crontab files which are named after accounts in
-.Pa /etc/passwd ;
-crontabs found are loaded into memory.
+for user crontab files which are named after accounts in
+.Pa /etc/passwd .
 The
 .Nm
-utility also searches for
-.Pa /etc/crontab
-and files in
-.Pa /etc/cron.d
+utility also searches for system crontab files in 
+.Pa /etc/crontab ,
+.Pa /etc/cron.d ,
 and
-.Pa /usr/local/etc/cron.d
-which are in a different format (see
+.Pa /usr/local/etc/cron.d .
+Crontabs found are loaded into memory.
+System crontab files are in a different format (see
 .Xr crontab 5 ) .
 .Pp
 The
@@ -71,9 +70,8 @@ checks the status of the account with
 .Xr pam 3
 and skips the command if the account is unavailable,
 e.g., locked out or expired.
-Commands from
-.Pa /etc/crontab
-bypass this check.
+Commands from system crontabs bypass this check.
+.Pp
 When executing
 commands, any output is mailed to the owner of the crontab (or to the user
 named in the
@@ -86,9 +84,8 @@ environment variable.
 Additionally,
 .Nm
 checks each minute to see if its spool directory's modification time (or
-the modification time on
-.Pa /etc/crontab )
-has changed, and if it has,
+the modification time on any system crontab files) has changed, 
+and if it has,
 .Nm
 will then examine the modification time on all crontabs and reload those
 which have changed.
@@ -119,10 +116,15 @@ This option can help to smooth down system load spikes during
 moments when a lot of jobs are likely to start at once, e.g.,
 at the beginning of the first minute of each hour.
 .It Fl J Ar rootjitter
-Enable time jitter for superuser jobs.
+Enable time jitter for superuser (user id 0) jobs.
 The same as
 .Fl j
-except that it will affect jobs run by the superuser only.
+except that it will affect jobs run by a superuser only.
+These jobs are either in the superuser's user crontab, or a 
+system crontab when the 
+.Em who
+field is specified as a superuser. The default is 0, which 
+effectively disables root time jitter.
 .It Fl m Ar mailto
 Overrides the default recipient for
 .Nm
@@ -222,9 +224,9 @@ Directory for optional/modularized system crontab files.
 configuration file for
 .Nm
 .It Pa /usr/local/etc/cron.d
-Directory for third-party package provided crontab files.
+Directory for third-party package provided system crontab files.
 .It Pa /var/cron/tabs
-Directory for personal crontab files
+Directory for user crontab files
 .El
 .Sh SEE ALSO
 .Xr crontab 1 ,