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);