> For the complete documentation index, see [llms.txt](https://developers.felt.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.felt.com/felt-style-language/style-definition-blocks/the-legend-block.md).

# The legend block

The legend block contains information on how the legend will be displayed for this visualization.

Take a look at [the legends section](/felt-style-language/legends.md) to see how it works.

These are the fields that each legend block can contain:

| Field name    | Description                                                                                                                                                                                                                                                                                                                                                             |
| ------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `displayName` | <p>Optional.<br><br>In categorical visualizations, a dictionary that maps from each category to what will be displayed on the legend.<br><br>In <a href="/pages/l19xNEDSN3qnKxQpzWjT">numeric</a> or <a href="/pages/hvXsaskqTHe4aJVaytZe">heatmap</a> visualizations, a dictionary that maps from the index of each class to what will be displayed on the legend.</p> |

{% code title="Example of a categorical legend" %}

```jsx
"legend": {
  "displayName": {
    "category-1": "Category 1",
    "category-2": "Category 2"
  }
}
```

{% endcode %}

{% code title="Example of a numerical legend" %}

```jsx
"legend": {
  "displayName": {
    "0": "-0.5", 
    "1": "0.5"
  }
}
```

{% endcode %}


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