# Display Chart Reference Marks

Reference lines and reference bands are available for the following visualisation types:

* [bar-chart](https://support.meetuma.ai/uma-knowledgebase/data-and-reporting/analytics-pro/charts/build-a-chart/bar-chart "mention")
* [line-chart](https://support.meetuma.ai/uma-knowledgebase/data-and-reporting/analytics-pro/charts/build-a-chart/line-chart "mention")
* [area-chart](https://support.meetuma.ai/uma-knowledgebase/data-and-reporting/analytics-pro/charts/build-a-chart/area-chart "mention")
* [scatter-plot](https://support.meetuma.ai/uma-knowledgebase/data-and-reporting/analytics-pro/charts/build-a-chart/scatter-plot "mention")
* [combo-chart](https://support.meetuma.ai/uma-knowledgebase/data-and-reporting/analytics-pro/charts/build-a-chart/combo-chart "mention")

### Add a reference mark

**Before you start:** This action uses the editor panel. If you have not done so already, open the editor panel from either Explore or Edit mode.

1. In the editor panel, select ![](https://sigma-docs-screenshots.s3.us-west-2.amazonaws.com/Icons/element-format.svg) **Element format**.
2. Open the **REFERENCE MARKS** section.
3. Click **+ Add new**.

   <figure><img src="https://files.readme.io/83ea279-1.png" alt=""><figcaption></figcaption></figure>
4. Expand the new reference mark, then select your reference mark type: **Line** (default) or **Band**.&#x20;

   <figure><img src="https://files.readme.io/e1df3d7-2.png" alt=""><figcaption></figcaption></figure>
5. Customise your reference mark with the remaining options, which differ for line and band reference marks.