text: 
  var chart = Highcharts.chart('container', {
  
      xAxis: {
          categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
      },
  
      series: [{
          data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
      }]
  });
  
  
  // the button action
  var hasPlotLine = false,
      $button = $('#button');
  
  $button.click(function () {
      if (!hasPlotLine) {
          chart.xAxis[0].addPlotLine({
              value: 5.5,
              color: 'red',
              width: 2,
              id: 'plot-line-1'
          });
          $button.html('Remove plot line');
      } else {
          chart.xAxis[0].removePlotLine('plot-line-1');
          $button.html('Add plot line');
      }
      hasPlotLine = !hasPlotLine;
  });
  