Eli Zaretskii <eliz@gnu.org> writes:

>> From: Robert Pluim <rpluim@gmail.com>
>> For vc-git-grep, or for every function that uses grep-read-files?
>
> The latter, I think.  If there are too many of those callers, then we
> could describe this once, say in grep-read-files, and then reference
> that, with something like
>
>   Including whitespace in the pattern requires quoting, see
>   `grep-read-files' for the details.

There are only 4 such (5 if you count zrgrep, which basically says
'see rgrep') and the addition is small, so I documented it in the
callers, and in grep-read-files.

Robert