How to Add, Edit, and Delete Cell Comments in Excel
Sometimes you may need to add notes to document complicated formulas, call out questionable values, or even to leave a comment for another user. Excel’s cell comments command helps you document your worksheets and make them easier to understand. Think of cell comments as sticky notes that you can attach to any cell. Cell comments appear whenever you point at the cell they’re attached to.
To display a comment all the time, click the cell with the comment, then click the Review tab on the Ribbon and click the Show/Hide Comments button in the Comments group.