Add a little symbol on the page when an annotation has a note

Most book reading apps allow you to add a note to a highlight. Very helpful. Both kindle and google play books - just to give two examples - then put a little symbol next to the highlight on the page, so you can see there's a note there. If you re-read the passage, it reminds you that there's a note you can look at. Strangely enough, book fusion does not do this. Please consider adding this feature. Very simple - put a 'stamp' (ie a little image) of the note symbol on the page next to the highlight that you can click on to bring up the note. At the moment, I can see there's note in the list of annotations, but not on the page itself that has the annotated passage. I would really love to have this feature. I think, to be honest, that it's kind of essential to add, it's important for most people like me who want to use the app for serious academic research.

Google play books does this well, it just adds a little page symbol in the margin to the right of the annotation. It doesn't get in the way at all but is clearly visible. The kindle app is worse, it adds a tiny little symbol at the end of the annotation itself, which is so small it's barely visible. But at least it's something. Having no visible indication that a note is present isn't ideal, I think.