UserNT
Note editor could benefit from ability to add comments to text.
When you select section of text and right click ther's option Add comment or Edit comment (if already exists).

When word (or sentence) has comment it s marked with dashed underline when hover over any text with comment for longer than one second it shows bubble with comment.

Example
2.png 
Quote
mcaton
Thanks for posting. I'll document your request.

Matt
Quote

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