Wordpress Themeviewer opened again

Hooray for Wordpress to sort out the Theme misery after almost one and a half years -
finally developers and users have one place to exchange their files again!
Now I need to make my themes compliant to the new wordpress theme regulations -

Most of my themes are solid, but the automated checker reports:
The stylesheet has no tags. Add a Tags: line to your style.css file and upload the zip file again

So what you have to do is add tags describing your theme, e.g. “widget ready, blue, white”, etc.