Include SmartCues libraries
                <script type="text/javascript" src="d3.annotator.js"></script>
                <script type="text/javascript" src="d3.annotator.touches.js"></script>

                //Adding SmartCues to a D3 bar-chart:
                var barAnnotator = d3.annotator.touches('bar')
                .attr("label","X-AXIS-ATTRIBUTE-NAME")
                .attr("value","Y-AXIS-ATTRIBUTE-NAME")
                CHART-SVG.call(barAnnotator);