Can someone explain that command to me? (MOVLW '0'-1)

I know what MOVLW is, and I understand the (default radix) of '0' (in 
which case I guess the radix doesn't matter anyway since it's 0), but 
I'm stumped by the "-1" on the end. I don't see any provision for that 
in the docs. What does that do?

Thanks,
Joe M.
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