# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# series.xrange.tooltip.valueDecimals

How many decimals to show in each series' y value. This is overridable in each series' tooltip options object. The default is to preserve all decimals.