Cell Notes in Excel Spreadsheets

Excel cell notes are used to put some extra information in a cell, like a description of the data in that cell or an explanation of a formula in the cell. This is very useful, especially for users are not aware of the meaning of the data, or who cannot view the whole spreadsheet (screen reader users).
Press Shift + F2 to create or edit a cell note.
Press Escape to come out of the cell note.
To delete a note, press Applications key on the cell, or press Shift +F10, for the context menu and then go to Delete Note, and press Enter.