> ## Documentation Index
> Fetch the complete documentation index at: https://terminal49-vorflux-dev-12120-supported-document-types.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Update a custom field

> Update the stored value on a custom field record in the Terminal49 API. The associated definition slug and parent resource reference remain unchanged.

Use this endpoint to update an existing custom field value.

## Path parameters

| Parameter | Description                                               |
| --------- | --------------------------------------------------------- |
| `id`      | The unique identifier of the custom field value to update |

## Request body

| Parameter | Required | Description                                                 |
| --------- | -------- | ----------------------------------------------------------- |
| `value`   | Yes      | The new field value (must match the definition's data type) |

## Behavior

* The new value is validated against the field definition's data type
* For enum fields, the value must match one of the definition's configured options
* The `updated_by` user is recorded for audit purposes
* Update pathway tracking records the source of the change