# The OpenAPI External Documentation Object
Source: https://speakeasy.com/openapi/external-documentation

import { Table } from "@/mdx/components";



Allows for providing information about external documentation available for the API, Operation, Tag, or Schema.

<Table
  data={[
    { field: "url", type: "String", required: "✅", description: "A URL to the external documentation." },
    { field: "description", type: "String", required: "", description: "A description of the external documentation. [CommonMark syntax](https://spec.commonmark.org/) can be used to provide a rich description." },
    { field: "x-*", type: "[Extensions](/openapi/extensions)", required: "", description: "Any number of extension fields can be added to the external documentation object that can be used by tooling and vendors." }
  ]}
  columns={[
    { key: "field", header: "Field" },
    { key: "type", header: "Type" },
    { key: "required", header: "Required" },
    { key: "description", header: "Description" }
  ]}
/>