lilo and System.map

I know this is an easy question because I've forgotten the answer. Do you need to do anything with /boot/System.map after recompiling the kernel? I've just recompiled 2.4.2 and run lilo and have System.map-2.4.2 in /boot. I also have System.map-2.2.14 from the original (6.4) installation. I seem to recall that you could have a file called simply System.map and that you had to do something special if you had two versions of the same kernel release. I just want to record this in my changelog. The new kernel works just fine. JDL