<div id="chart"></div>
<script>
$("#chart").kendoChart({
  valueAxis: [{
    notes: {
      position: "top",
      data: [{
        value: 5,
        text: "Important value"
      }]
    }
  }],
  series: [
    { data: [1, 2, 3, 4, 5, 6] }
  ]
});
</script>