question about booting hurd

[Juanjo Marín <juanjo96@arrakis.es>]

Hi there,

I'm new on Hurd, in the process of installing on my box :-))), and I have 
the following question:

On Neal H Walfield's  'The Hurd Installation Guide' it is said to boot hurd 
with

grub> module /hurd/ext2fs.static 
--multiboot-command-line=${kernel-command-line} 
--host-priv-port=${host-port} --device-master-port=${device-port} 
--exec-server-task=${exec-task} -T typed ${root} $(task-create) $(task-resume)

       [Multiboot-module  0x1c4000, 0x2cfe6a bytes]

grub> module /lib/ld.so.1 /hurd/exec $(exec-task=task-create)

       [Multiboot-module  0x494000, 0x27afe bytes]

but on Matthew Vernon's 'The easy guide to installing Hurd on a Linux box' 
these commands aren't mentioned

so....
    Are these commands compulsory or optional ????
    Are useless or not ????


I really appreciate your help,

      Juanjo