Associating a comment / note / pop up box with a particular Excel cell can help clear up any confusion either you or the user of your Excel spreadsheet might have in the future. Putting notes that appear to the side of the cell when the cell is clicked on can help answer any questions a user might have about that particular cell or cells.
Making a note, comments, pop up box appear near an Excel cell is pretty easy to do. I wrote about how to do this on my blog, TurtleDogs Blog, and have linked it below. Check it out. It is a handy spreadsheet tip.

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