diff --git a/src/collection-api/routes/metadata.js b/src/collection-api/routes/metadata.js
index 7ae8d4ce..0f268c9c 100644
--- a/src/collection-api/routes/metadata.js
+++ b/src/collection-api/routes/metadata.js
@@ -29,63 +29,82 @@ const PACKAGE_JSON_PATH = '../../../package.json';
  *       properties:
  *         id:
  *           type: string
- *           description: Unique identifier of the collection
+ *           description: Unique identifier derived from name (acronyms, dash-separated).
+ *           example: pga
  *         name:
  *           type: string
- *           description: Display name of the collection
+ *           description: Display name of the collection.
+ *           example: Platform Governance Archive
  *         tagline:
  *           type: string
- *           description: Short description of the collection
+ *           description: Concise description of collection topic.
+ *           example: Major global social media services
+ *         languages:
+ *           type: array
+ *           description: List of [ISO 639-1 (two-letter)](https://en.wikipedia.org/wiki/ISO_639) language codes representing languages allowed in the collection.
+ *           example: [en, fr, de]
+ *           items:
+ *             type: string
+ *             format: iso639-1
+ *         jurisdictions:
+ *           type: array
+ *           description: List of [ISO 3166-2 country codes](https://en.wikipedia.org/wiki/ISO_3166-2) representing jurisdictions covered by the collection.
+ *           example: [EU]
+ *           items:
+ *             type: string
+ *             format: iso3166-2
  *         description:
  *           type: string
- *           nullable: true
  *           description: Detailed description of the collection
+ *           example: |
+ *             The **Platform Governance Archive** (PGA) collection tracks the terms of major global social media services.
+ *
+ *             This data is maintained and analysed by the [Platform Governance Archive](https://www.platformgovernancearchive.org/) at the Universität Bremen's [Center for Media Communication and Information Research (ZeMKI)](https://www.uni-bremen.de/zemki).
+ *
+ *             This initiative offers researchers, journalists and citizens the tools to analyze how platforms structure and regulate communication and interaction in our societies.
+ *
+ *             It also aims to promote greater transparency and accountability of these powerful digital services.
  *         totalTerms:
  *           type: integer
- *           description: Total number of terms tracked in the collection
+ *           description: Total number of terms tracked in the collection.
+ *           x-ota-generated: true
  *         totalServices:
  *           type: integer
- *           description: Total number of services tracked in the collection
+ *           description: Total number of services tracked in the collection.
+ *           x-ota-generated: true
  *         engineVersion:
  *           type: string
- *           description: Version of the Open Terms Archive engine in SemVer format (MAJOR.MINOR.PATCH)
+ *           description: Version of the Open Terms Archive engine in SemVer format (MAJOR.MINOR.PATCH).
+ *           x-ota-generated: true
  *         dataset:
  *           type: string
  *           format: uri
- *           description: URL to the dataset releases
+ *           description: URL to the dataset releases.
+ *           example: https://github.com/OpenTermsArchive/pga-versions/releases
  *         declarations:
  *           type: string
  *           format: uri
- *           description: URL to the declarations repository
+ *           description: URL to the declarations repository.
+ *           example: https://github.com/OpenTermsArchive/pga-declarations
  *         versions:
  *           type: string
  *           format: uri
- *           description: URL to the versions repository
+ *           description: URL to the versions repository.
+ *           example: https://github.com/OpenTermsArchive/pga-versions
  *         snapshots:
  *           type: string
  *           format: uri
- *           description: URL to the snapshots repository
+ *           description: URL to the snapshots repository.
+ *           example: https://github.com/OpenTermsArchive/pga-snapshots
  *         donations:
  *           type: string
  *           format: uri
- *           description: URL to the donations page
+ *           description: URL to the donations page.
+ *           example: https://opencollective.com/opentermsarchive
  *         logo:
  *           type: string
  *           format: uri
- *           nullable: true
- *           description: URL to the collection logo
- *         languages:
- *           type: array
- *           description: List of ISO 639-1 (two-letter) language codes representing languages allowed by the collection
- *           items:
- *             type: string
- *             format: iso639-1
- *         jurisdictions:
- *           type: array
- *           description: List of ISO 3166-2 country codes representing jurisdictions covered by the collection
- *           items:
- *             type: string
- *             format: iso3166-2
+ *           description: URL to the collection's logo. Optimized PNG transparent image (min width 240px).
  *         trackingPeriods:
  *           type: array
  *           items:
@@ -99,18 +118,22 @@ const PACKAGE_JSON_PATH = '../../../package.json';
  *               startDate:
  *                 type: string
  *                 format: date
- *                 description: The date when tracking started for this period
+ *                 description: The date when tracking started for this period (ISO 8601 format YYYY-MM-DD).
+ *                 example: 2023-01-01
  *               schedule:
  *                 type: string
  *                 format: cron-expression
- *                 description: A cron expression defining when terms are tracked (e.g. "0 0 * * *" for daily at midnight)
+ *                 description: A [cron expression](https://en.wikipedia.org/wiki/Cron#Cron_expression) that defines the tracking frequency.
+ *                 example: 0 0 * * *
  *               serverLocation:
  *                 type: string
- *                 description: The geographic location of the server used for tracking
+ *                 description: The geographic location of the tracking server (city name, ISO 3166-2 country code).
+ *                 example: London, GB
  *               endDate:
  *                 type: string
  *                 format: date
- *                 description: The date when tracking ended for this period
+ *                 description: The date when tracking ended for this period (ISO 8601 format YYYY-MM-DD). If not specified, tracking is ongoing.
+ *                 example: 2023-12-01
  *         governance:
  *           type: object
  *           description: Map of organizations involved in the collection's governance, with organization names as keys
@@ -124,13 +147,16 @@ const PACKAGE_JSON_PATH = '../../../package.json';
  *                 type: string
  *                 format: uri
  *                 description: URL to the entity's website
+ *                 example: https://opentermsarchive.org/
  *               logo:
  *                 type: string
  *                 format: uri
- *                 description: URL to the entity's logo
+ *                 description: URL to the entity's logo. Optimized PNG transparent image (min width 240px).
+ *                 example: https://opentermsarchive.org/images/logo/logo-open-terms-archive-black.png
  *               roles:
  *                 type: array
  *                 description: Roles of the entity within the governance, see [collection governance](https://docs.opentermsarchive.org/collections/reference/governance/)
+ *                 example: [host, administrator]
  *                 items:
  *                   type: string
  *                   enum: [host, administrator, curator, maintainer, sponsor]