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Just add docsService.registerDocs in your code. For example 
// resources/account/actions/sign-up/doc.ts
const config: RouteExtendedConfig = {
  private: false,
  tags: [resourceName],
  method: 'post',
  path: `/${resourceName}/sign-up`,
  summary: 'Sign up',
  request: {},
  responses: {},
};
export default config;

// resources/account/actions/sign-up/index.ts
import docConfig from './doc';

export default (router: AppRouter) => {
  docsService.registerDocs(docConfig);

  router.post('/sign-up', validateMiddleware(schema), validator, handler);
};
Here we just added /account/sign-up path to open api specification. Later on we will learn how to customise it. To look at result you can launch application and make call to api endpoint with /docs/json path. E.g. http://localhost:3002/docs/json if you’re using local server. It will return you json specification in Open API standard. You can use tools like Swagger Editor to see it in pretty editor. In order to add body, params or query, you can add zod schema inside request property. E.g. for body it will look like that: 
// schemas/empty.schema.ts
export const EmptySchema = docsService.registerSchema('EmptyObject', z.object({}));

// resources/account/actions/sign-up/schema.ts
export const schema = z.object({
  firstName: z.string().min(1, 'Please enter First name').max(100),
  lastName: z.string().min(1, 'Please enter Last name').max(100),
  email: z.string().min(1, 'Please enter email').email('Email format is incorrect.'),
  password: z.string().regex(
    PASSWORD_REGEXP,
    'The password must contain 6 or more characters with at least one letter (a-z) and one number (0-9).',
  ),
});

// resources/account/actions/sign-up/doc.ts
import { resourceName } from 'resources/account/constants';
import { schema } from './schema';
import { EmptySchema } from 'schemas/empty.schema';

const config: RouteExtendedConfig = {
  private: false,
  tags: [resourceName],
  method: 'post',
  path: `/${resourceName}/sign-up`,
  summary: 'Sign up',
  request: {
    body: { content: { 'application/json': { schema } } },
  },
  responses: {
    200: {
      description: 'Empty data.',
      content: {
        'application/json': {
          schema: EmptySchema,
        },
      },
    },
  },
};

export default config;
Here we also added details inside responses property to let api user know what we might expect from there. For that we have used docsService.registerSchema function. For more details you can look at this documentation For query, it will look like that: 
// resources/account/actions/verify-email/schema.ts
export const schema = z.object({
  token: z.string().min(1, 'Token is required'),
});

// resources/account/actions/verify-email/doc.ts
import { resourceName } from 'resources/account/constants';
import { schema } from './schema';

const config: RouteExtendedConfig = {
  private: false,
  tags: [resourceName],
  method: 'get',
  path: `/${resourceName}/verify-email`,
  summary: 'Verify email',
  request: {
    query: schema,
  },
  responses: {
    302: {
      description: 'Redirect to web app',
    },
  },
};

export default config;
Also, there is an option to make the endpoint secure. Just set the private property to true, and it will add JWT authorization to this endpoint. If your auth method is not JWT, then there is built-in cookie-auth strategy. To update set it, you can set authType in config. 
// resources/account/actions/verify-email/doc.ts
import { resourceName } from 'resources/account/constants';
import { schema } from './schema';

const config: RouteExtendedConfig = {
  private: false,
  authType: 'cookieAuth',
  tags: [resourceName],
  method: 'get',
  path: `/${resourceName}/verify-email`,
  summary: 'Verify email',
  request: {
    query: schema,
  },
  responses: {
    302: {
      description: 'Redirect to web app',
    },
  },
};

export default config;
If you need other strategies, please look at docs.service.ts file. There will be option to extend methods like that: 
registry.registerComponent('securitySchemes', 'customAuth', {
  type: 'apiKey',
  in: 'cookie',
  name: 'JSESSIONID',
});
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