# Experiment Custom Section Fields \[UPDATE]

```
PUT 
/experiment_custom_section_fields/:id
```

**Required Permissions**: `ExperimentCustomSection Update` or `ExperimentCustomSection Admin`

> **caution**
>
> Regular fields provided in the request will be updated. Regular fields not included in the request body will retain their existing values.
>
> However, when updating experiment custom section field values through the Experiments endpoint, ALL existing field values will be DELETED and replaced with only those provided in the request.

## Request

## Responses

* 200
* 400
* 401
* 403
* 404

OK

Bad Request

Unauthorized

Forbidden

Not Found