# Update Highlight

Update an existing highlight.

**Endpoint**: `PUT /api/media-items/highlights/{highlight_id}`
**Auth**: Required
**Content-Type**: `application/json`

## Path Parameters

| Parameter | Type | Required | Description |
|-----------|------|-----------|-------------|
| highlight_id | string | Yes | Highlight UUID |

## Request Body

| Field | Type | Required | Description |
|--------|------|-----------|-------------|
| selection_text | string | No | Updated highlighted text |
| color | string | No | Updated highlight color (hex) |

### Example Request

```json
{
  "selection_text": "Updated text",
  "color": "#00ff00"
}
```

## Response (200 OK)

```json
{
  "id": "uuid",
  "media_item_id": "uuid",
  "user_id": "uuid",
  "selection_text": "Updated text",
  "color": "#00ff00",
  "updated_at": "2026-01-31T10:00:00Z"
}
```

## Error Responses

| Code | Description |
|------|-------------|
| 400 | Invalid highlight data |
| 401 | Invalid or expired token |
| 403 | User does not own this highlight |
| 404 | Highlight not found |
