News - automatic download to device

I cant remember if this is something I've selected in the past or whether its an inherent part of calibre operation - the description of recipe operation suggests it might be inherent as it says news will be downloaded to a device if one is connected at the time the 'news' book is created.

Anyway, is this something I can turn off ? I much more often read 'news' books on the PC at the moment so would prefer to select those I want to download.

Would changing 'main' in send_news_to_device_location = u'main' (btw whats the u for) to a blank do the trick ?