It's good practice to fill in the description field for a property to give an editor a hint as to what type of content should be filled in to it, but sometimes there isn't really enough space to convey all the information you'd like to pass on.
This package allows you to create a 'read only' property that can sit amongst your other document type properties containing much more explanitory text, as much as you'd like, and as the read only property is edited using the rich text editor, you can make the information for editors look real pretty and have links and embed videos and everything... just like the original (and the best) 'notes' property editor type in uComponents courtesy of Matt Brailsford. (http://ucomponents.org/data-types/notes/ - it is his idea)
You can make the note collapsible, so the editor doesn't have to read the same thing everyday, if they've closed the note. It uses local storage and so should remember whether the editor has previously collapsed it or not.
More here in these blog posts:
Now available for V9
Version 9.0.4 is for Umbraco V9 (install via Nuget)
Version 8.0.1 is for Umbraco V8
Version 0.0.3 is for Umbraco V7