The Include group box allows you to specify whether or not you want to include a total for all months specified and/or a year-to-date total.

Totals Select the Totals check box if you want the total for all months specified on the Options tab included on the graph.
YTD Totals Select the YTD Totals check box if you want the year-to-date total (i.e., the first month of your reporting year through the current reporting month) included on the graph.