mouse acceleration profiles

[westlake]

I was wondering about on the site
http://xorg.freedesktop.org/wiki/Development/Documentation/PointerAcceleration/

there's a mention in the  The AccelerationProfile [integer] subsection, 
"-1 none"

for common courtesy isn't it supposed to be
'0 none' ?

xinput --set-prop command doesn't warrant -1, but does so starting from 
0 {:)

I'm curious about this since I was having a problem with a particular 
Desktop/mouse setting and landed up to this wiki page

Thanks..

-Scott