# Update an Activity Custom Field

PUT https://api.close.com/api/v1/custom_field/activity/{id}/
Content-Type: application/json

You can rename it, change whether it accepts multiple values or not, change the "required" flag, change whether editing its values is restricted to specific Roles, or update the options for a "choices" field type. The updated name will immediately appear in the Close UI and only valid values for the updated `type` will be returned by the Custom Activity API.

The `custom_activity_type_id` and `type` values cannot be changed.

Reference: https://developer.close.com/api/resources/custom-fields/custom-fields-activity/update

## OpenAPI Specification

```yaml
openapi: 3.1.0
info:
  title: Close API
  version: 1.0.0
paths:
  /custom_field/activity/{id}/:
    put:
      operationId: update
      summary: Update an Activity Custom Field
      description: >-
        You can rename it, change whether it accepts multiple values or not,
        change the "required" flag, change whether editing its values is
        restricted to specific Roles, or update the options for a "choices"
        field type. The updated name will immediately appear in the Close UI and
        only valid values for the updated `type` will be returned by the Custom
        Activity API.


        The `custom_activity_type_id` and `type` values cannot be changed.
      tags:
        - subpackage_customFieldsActivity
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: string
        - name: Authorization
          in: header
          description: Basic authentication
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: >-
                  #/components/schemas/custom_fields.activity_update_Response_200
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                description: Any type
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                description: Any type
        '404':
          description: Not found
          content:
            application/json:
              schema:
                description: Any type
      requestBody:
        content:
          application/json:
            schema:
              description: Any type
servers:
  - url: https://api.close.com/api/v1
components:
  schemas:
    custom_fields.activity_update_Response_200:
      type: object
      properties: {}
      description: Empty response body
      title: custom_fields.activity_update_Response_200
  securitySchemes:
    ApiKeyAuth:
      type: http
      scheme: basic
    OAuth2:
      type: http
      scheme: bearer

```