> ## Documentation Index
> Fetch the complete documentation index at: https://developers.plane.so/llms.txt
> Use this file to discover all available pages before exploring further.

# Update a custom property

> Updates an existing custom property by setting the values of the parameters passed. Any parameters not provided will be left unchanged.

## Path parameters

<ParamField path="workspace_slug" type="string" required>
  The workspace\_slug represents the unique workspace identifier for a workspace in Plane. It can be found in the URL. For example, in the URL `https://app.plane.so/my-team/projects/`, the workspace slug is `my-team`.
</ParamField>

<ParamField path="project_id" type="string" required>
  The unique identifier of the project.
</ParamField>

<ParamField path="type_id" type="string" required>The unique identifier for the work item type.</ParamField>

<ParamField path="property_id" type="string" required>The unique identifier for the custom property.</ParamField>

## Body parameters

<ParamField body="display_name" type="string" required>
  Display name shown in the UI.
</ParamField>

<ParamField body="description" type="string">Description of the custom property.</ParamField>
<ParamField body="property_type" type="string" placeholder="TEXT | DATETIME | DECIMAL | BOOLEAN | OPTION | RELATION">Type of the property. Possible values: `TEXT`, `DATETIME`, `DECIMAL`, `BOOLEAN`, `OPTION`, `RELATION`.</ParamField>
<ParamField body="relation_type" type="string" placeholder="null | USER">Relation type if the property links to other entities. Possible values: `null`, `USER`.</ParamField>
<ParamField body="default_value" type="string[]">Default value(s) for the property.</ParamField>
<ParamField body="validation_rules" type="object">Validation rules applied to property values.</ParamField>
<ParamField body="is_required" type="boolean">Whether this property is required when creating work items.</ParamField>
<ParamField body="is_active" type="boolean">Whether this property is currently active.</ParamField>
<ParamField body="is_multi" type="boolean">Whether this property allows multiple values.</ParamField>