--- crontab.5.orig	2004-02-19 20:40:04.954132624 +0000
+++ crontab.5	2004-02-19 20:45:27.033169168 +0000
@@ -153,6 +153,32 @@
 ``30 4 1,15 * 5''
 would cause a command to be run at 4:30 am on the 1st and 15th of each
 month, plus every Friday.
+.PP
+Instead of the first five fields, one of eight special strings may
+appear:
+.IP
+.ta 1.5i
+string	   meaning
+.br
+------	   -------
+.br
+@reboot	   Run once, at startup.
+.br
+@yearly	   Run once a year, "0 0 1 1 *".
+.br
+@annually	   (same as @yearly)
+.br
+@monthly	   Run once a month, "0 0 1 * *".
+.br
+@weekly	   Run once a week, "0 0 * * 0".
+.br
+@daily	   Run once a day, "0 0 * * *".
+.br
+@midnight	   (same as @daily)
+.br
+@hourly	   Run once an hour, "0 * * * *".
+.br
+.fi
 .SH EXAMPLE CRON FILE
 .nf
 
