The Annotations view annotates the lines of code in your source files. Annotations make it easier to find when a change was introduced. You can also see who made a change and why. Each annotation displays the item revision and the name of the user who delivered the change. Hover over an annotation to view additional information about an item revision such as:
The date and time of the delivery.
Its related change requests.
Any comments added by the user
You can also use the ANNOTATE command in the DMCLI command-line client to list file annotations.