Formail: what is the +skip option for and why?

I an redoing some older scripts, and I don't understand why I have a +1 
in the formail statement.  With or without, the answer is the same - so 
what is it used for?

[sda(_at_)beaujolais ~]$ formail -X'From ' -cs < $HOME/mail/junk | wc -l
      126
[sda(_at_)beaujolais ~]$ formail +1 -X'From ' -cs < $HOME/mail/junk | wc -l
      126


Many thanks,
Steve :)

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