# Annotations

Sometimes you'll need to create milestones or threshold lines. This is possible by creating annotations for dimensions. You can created dynamic or static annotations via the dimension popup. Please see the examples below.

The following math and statistical functions are available for numeric annotations:

## SUM(numerical expression)

Returns the sum of a series of numbers.

## AVG(numerical expression)

Returns the average of a series of numbers.

## MIN(numerical expression)

Returns the minimum of a series of numbers.

## MAX(numerical expression)

Returns the maximum of a series of numbers.

## MEDIAN(numerical expression)

Returns the number in the middle of a set of numbers.

## STDEV(numerical expression)

Estimates standard deviation based on a sample. The standard deviation is a measure of how widely values are dispersed from the average value (the mean).

Last updated