-.Fn Reboot
-reboots the system.
-Only the super-user may reboot a machine on demand.
-However, a reboot is invoked
-automatically in the event of unrecoverable system failures.
+.Fn reboot
+reboots the system. Only the super-user may reboot a machine on demand.
+However, a reboot may be invoked automatically in the event of
+unrecoverable system failures. Programs other than
+.Xr reboot 8
+should not call
+.Fn reboot .
+.Xr Shutdown 8
+or a higher-level API will shut the system down cleanly.