title: How to highlight a point on a Simple Line Chart in NVD3?
body: <p>I have a Simple Line Chart in NVD3 like this one <a href="http://nvd3.org/examples/line.html" rel="nofollow">http://nvd3.org/examples/line.html</a></p>
  
  <p>I would like to highlight (overlapping a circle for example) one particular point (a given x) on my serie. </p>
  
  <p>I haven't found something similar to the Highcharts addPoint() in NVD3, example: <a href="http://api.highcharts.com/highcharts#Series" rel="nofollow">http://api.highcharts.com/highcharts#Series</a></p>
  
  <p>Moving the tooltip programmatically could work as well.</p>
  
  <p>Thanks in advance!</p>