title: Displaying custom dataset properties in tooltip in chart.js
body: <p>What would be the easiest way possible to display custom properties in the pie chart tooltip?</p>
  
  <pre><code>var pieData = [
      {
          value: 40,
          color:"#F7464A",
          highlight: "#FF5A5E",
          label: "Label 1",
          description: "This is a description for label 1"
      },
      {
          value: 60,
          color: "#46BFBD",
          highlight: "#5AD3D1",
          label: "Label 2",
          description: "This is a description for label 2"
      }
  ];
  
  var options = {
      tooltipTemplate: "&lt;%= label %&gt; - &lt;%= description %&gt;"
  };
  
  window.onload = function(){
      var ctx = document.getElementById("chart-area").getContext("2d");
      window.myPie = new Chart(ctx).Doughnut(pieData, options);
  };
  </code></pre>
  
  <p>I tried simply adding a "decription" property and then printing it, but without any luck. It just gives me an error saying description is not defined. I saw that there is a custom tooltip functionality, but that seemed like a lot of work for something trivial. Is there an easier way?</p>