Spread.Services enables users to annotate a worksheet by allowing them to write comments on cells in order to specify additional information about the data it contains.

For instance, let us assume you want users to enter only the numeric information in an individual cell of a worksheet. To accomplish this, instead of populating a small cell with large notes, it is more ideal to use a short comment (something like "Please enter only numeric characters in this cell") in order to provide additional context for the data represented in that cell.

The cells annotated with comments will display a small red indicator (at the corner of the cell) which appear when your mouse pointer is placed on that particular cell. The text in the comments can be edited, copied and formatted. Also, the comments can be moved, resized or deleted, can be made hidden or visible and their indicators can also be customized as per your preferences.

For more information on comments, refer to Apply Comments in this documentation.