It'd be handy if I had a small Notes section, where I could make notes about my hub. e.g. I could note if/when I pinned it or shared it, so I know if I've done it before - or scribble down the keyword/phrase I was aiming the hub at.
If I'm in a hurry, even scribble a note of a modification/update I wanted to do next time I was there.
It wouldn't need to be large, just a small scribble box for a few notes.
As Mark suggested, you can add a hidden text capsule to each Hub and record whatever information you may like. There are also users who keep track of such information using tools like a Google Drive spreadsheet.