Install debian from cd
 

This is probably obvious.

I've installed debian from the first cd of the complete debian cd set to a machine that has no network card. The install has gone fine. I now want to use aptitude to install a package which is on cd 5. However i don't know how to get aptitude to update and read the package list off cd 5. My sources.list has a cdrom entry for the first cd and i've tried copying it for the 5th cd but to no avail.

Where am i going wrong?

I just worked it out.... apt-cdrom add