Re: debugging.texi

[Richard Stallman]

          @var{function-name} in the minibuffer.  If @var{function-name} is
        ! omitted, @code{nil} or the empty string, it cancels break-on-entry 
for all

    You need a comment after @code{nil} to eliminate a misreading.  With
    that change, please install.

Correction--you need a comma after...