Hello,

Attached a small patch mentioning the obsolete '-j1 N' syntax.

Becuse it is rather rare, I only added it to the texinfo
manual, not to the man-page (or --help screen).

I'm 50:50 about whether this justifies an entire section in the manual,
or perhaps it'll be enough to mention it in the 'gotcha' page.

Comments welcomed,
 - assaf