Add a note at a specific x or y-axis value in your chart to provide your Teammates with some context for the data.
Y-axis annotations can be useful for setting a target line.
Add an annotation
From the dashboard, hover over your chart and click the gear icon to open its context menu. Select Edit Settings.
Switch to the Annotation tab, and click +Add New Annotation.
Choose which axis you’d like to add the annotation to, and enter the axis value where the annotation should be placed. Enter your note in the Label text field.
Uncheck Show annotation labels on chart to display annotations only on hover, in the tooltip.