5.3 on Intel 386 ?

[Rob]

Hi,

I thought 386 support had been removed since 5.X. But
  http://www.freebsd.org/releases/5.3R/installation-i386.html
says:

   1.2 Hardware Requirements
   FreeBSD for the i386 requires a 486 or better processor to install
   and run (although FreeBSD can run on 386 processors with a custom
   kernel)....

What does this mean?
Should I install on 486 or higher, build a custom kernel and then
physically put the very same disk in a 386 PC?

Rob.