( I didn't find anything with "annotation" on the forums - has this not been suggested yet? )
I finished a model but would like to mark some "to do" items next to it, to remember what could be further developed next time I return to it.
Currently, there doesn't seem to be any way to add such textual remarks? I believe it should be very handy - I use it with i.e. PDFs all the time.
I hope this is coming in at some stage. How do other CAD systems implement it?