vsftpd wont start at boot

[Jonathan Horne]

i compiled vsftpd from ports today.  at the end of the install, it asks me to 
add vsftpd_enable="YES" to /etc/rc.conf, and also that i should add:

listen=YES
background=YES

to /usr/local/etc/vsftpd.conf.  when i do all those things, vsftpd will start 
when i issue it from a terminal, but it will not start at boot.

can someone point me in the right direction here?

thanks,
Jonathan Horne