Normal initramfs images start by executing the program or script
called C</init>. febootstrap does not create this script, so you may
wish to, particularly for very minimal bootstraps that don't have the
-normal SysVinit/upstart machinery.
+normal SysVinit/upstart machinery. It's also required if the kernel
+cannot find a "real" root filesystem (the root filesystem that we
+built and placed in an initramfs doesn't count).
Linux will try to run the following commands in turn, unless you
override it using the C<init=I<cmd>> kernel option: