Just that really!
I've got a very brief section on my cv which explains a 3 year gap in employment. Have mentioned that I have kept up to date with developments in industry, and also briefly mentioned running community groups and some volunteering I do. The volunteering is relevant to my sector and has transferable skills.
I also have a very tiny Etsy business, which has generated a couple of hundred pounds of revenue. Not a lot, but its a hobby I enjoy and every bit of extra cash has been handy.
I was thinking of writing something along the lines of "During this time I have....[blah blah blah].. and set up an online micro business"
But I now think that sounds a bit too grand for such a tiny "business"! I wouldn't want recruiters to think I was prone to massive exaggerations/bullshit.
I don't want to go into too much detail about it on my cv (space issues), and its not particularly relevant to the role beyond emphasising that I haven't been sat on my bum for the last few years.
So - mention it or not?