Before Git commit e8046d2, lines like this were treated as comments in
org-mode:
### This used to be a comment
At present, lines as the above are not highlighted as comments and will
be exported verbatim. Only lines like the following are considered to be
comments, currently:
# Only this is now a comment
This behavior is clearly in contradiction with the documentation,
according to this relevant part of doc/org.texi:
@node Comment lines, , Horizontal rules, Structural markup elements
[snip]
Lines starting with zero or more whitespace characters followed by @samp{#}
are treated as comments and will never be exported.
Please, fix the documentation (or restore the previous behavior, if the
documentation is meant to be correct).
Cheers,
Rafael