Package: apt Version: 0.3.19 Severity: minor apt's man page does not mention the existence of apt-cdrom, apt-setup, apt-config, not even under SEE ALSO.
At least in my case, it took a long time to find out about apt-cdrom, as it was not mentioned in apt's or apt-get's man page, nor in the Debian FAQ's or /usr/doc/apt or in the Installation Guide. (Ideally, it should be mentioned there, too, of course.)
