Comments in markdown files

Anyone know a tidy way to have hidden comments in .md files (that aren't output as html at all)?
Best I've come up with is:

Not testet, but maybe usefull:
http://stackoverflow.com/questions/4823468/comments-in-markdown

Yep that's where I got the idea :)

you can also write twig commented parts wrapped in {# lorem ipsum #}
Don't forget to switch process twig to true in 'advanced' and it should work.