Input Message for Data Validation

When you specify data validation for a cell or range of cells, you can optionally define a note or help message that appears as soon as the user clicks on the cell. It could be a simple message like "Please enter a whole number less than 10" so that the user is aware that there is a restriction on the data he is about to enter.

Input message is optional and is set using the Data Validation dialog - select the Validation command from the Data menu and select Input Message to see this dialog.

See also:

Defining an Error Message for invalid entries