JuliaLang/julia — pull request #9159 by lucasb-eyer (2014-11-26 09:51:10+00:00)
Title: Document `join`'s optional `last` parameter.

I'm not a native English speaker, so I can't decide if this or

> If ``last`` is given, it will be used between the last two strings instead of ``delim``.

is better?