Fields can have comments that describe them. The comments display in a tooltip in the Data window and in the Calculated fields dialog box. Field comments are a good way to give more context to the data in your data source. Comments are especially useful when you are building a workbook for others to use.
Adding a Comment to a Field
Right-click a field in the Data window
and select .
Write a comment in the subsequent dialog box. Comments
support rich text formatting that will be represented in the tooltip.
When finished, click OK.