Warning from pacman

Hi,
I have noticed a warning appear in pacman.conf
cannot paste actual because of sway...i cannot work out how hehe.
wayland and different windows etc.
as follows
............
warning : config file /etc/pacman.conf , line 34: directive 'TotalDownload' in section 'options' not recognised.
...............
My questions are
What should it say? Or should it not be there?

I actually thought i may have done something wrong, rolled back as far as i could and always there.
It is straight from iso (soaring from April if any help).
As it is optional...can i delete... i always worry when i see a warning.
Thank in advance .
noob tester,
Nebo.
P.S. again, thanks for this spin, love it.