One thing I’m missing, or haven’t found… Is a way to easily keep notes and document my hass-setup.
For example, add a note to my z-waveplug when the meter was last reseted, or a lamp was changed, or for that matter, when it was installed. Or just some notes of things tried, but didn’t work…
The best option(?) is to have an extra attribute named something like “notes”. So it is easily found 
you can already create custom attributes:
homeassistant:
customize:
switch.whatever:
notes: add some notes here
not sure if you can do it thru the UI tho.
of course, thanks for the reminder… completeley forgot about customize, at least som eons ago you, if my memory serves me right, you could do it through UI.
Just to hope that it one day will be easily available directly from the entity in the UI.
This would be very nice to have.
If we would have an option via the UI, that would be great.
I would like to add some info, description or notes to a lot of devices and entities, mainly to keep my setup clean.
Agreed, this would be awesome!
Also, notes/comments in automations done in UI would also be very helpful.
You have the option in automation, when you rename it
Thanks, but I was thinking of # style comments that can be entered in yaml mode but then are stripped by the UI editor.
Agree. It would come in handy with a notes function where e.g. battery type or other info relevant to the single user could be entered.
Regarding battery type you could give GitHub - andrew-codechimp/HA-Battery-Notes: A Home Assistant integration to provide battery notes of devices a try.
Agreed. Would love to have a comment/note field on every device and entitiy.
Same here. Would love to have this
If we had this I would not need my notebook in my desktop drawer. In this notebook I have listed all my devices and what they do.