It is possible to attach comments to any cell, this can be done by right-clicking a cell and choosing Insert Comment from menu. An alternative way is by selecting Review - Comments - New Comment.
Comments added in this way can be displayed or hidden by the user, which is done via Review - Comments - and then Show All Comments toggle.
If a user has chosen to hide all comments and comment indicators then any message which has been added to the workbook will most likely go unseen.
However, there is a method which can be used to ensure that a comment will always be seen regardless of whether the user has chosen to hide comments. This is achieved by using Excel's Data Validation feature, which will display a pop-up message whenever a cell is activated.
To add a message to a cell using the Data Validation feature:
- Activate the cell which you would like to add a message to
- Select Data - Data Tools - Data Validation
- The Data Validation dialog box will pop up, here click on Input Message
- Enter an optional title for the message in the Title field, and then the message itself in the Input Message box
- Click OK and the Data Validation dialog box will close.
Now whenever that particular cell is activated the message you entered will always appear.
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