Add comments to cells to explain what the cells contain.
Add a comment
Right-click a cell and click Insert Comment.
In the comment box, type your comment.
Click outside the comment box.
The comment box disappears, but a red comment indicator remains. To see the comment, hover over the cell.
Tip: To format your comment, highlight the text you want to change, right-click on the comment and choose Format Comment.
Select the Review tab, and click Next or Previous to see each comment in sequence.
See all comments at once
Select Review > Show All Comments to show or hide comments.
You may need to move or resize overlapping comments.
Note: Select Review > Show/Hide Comment to show or hide individual comments.
Move a comment
Drag the border of the comment box.
Resize a comment
Drag one of the handles on the sides or corners of the comment box.