diff --git a/omp-docs/references/okf-spec.md b/omp-docs/references/okf-spec.md
index 6add03b..d2a69e7 100644
--- a/omp-docs/references/okf-spec.md
+++ b/omp-docs/references/okf-spec.md
@@ -20,8 +20,13 @@ timestamp: 2026-01-15
 > optional trust/lifecycle fields (`verified: { by, at }`, `status`,
 > `stale_after`) and the `Attested Computation` type, and permits `okf_version:`
 > frontmatter in a bundle-root `index.md`. This bundle stays on v0.1 semantics
-> (kb-lint enforces them); the bundle-local `verified:` date stamp and `tags`
-> discipline are producer extensions compatible with both versions.
+> (`kb-lint` enforces them). What the optional fields mean HERE, measured 2026-10-21:
+> `description` on every concept page; `tags` on 22 of 76 concept pages and no tool reads
+> them; `resource` only where the page describes an external thing; `verified: YYYY-MM-DD`
+> = "the facts on this page were re-checked against the fleet that day", and a page with no
+> `verified` has never been re-checked. House link style is bundle-absolute
+> (`/tools/niri/tips.md`) for anything crossing a directory. `[[wikilinks]]` are not OKF
+> links — this bundle's 53 of them were converted to markdown links on 2026-10-21.
 
 # Open Knowledge Format (OKF) v0.1
 
@@ -167,3 +172,9 @@ Everything else is soft guidance. Consumers MUST NOT reject a bundle because of
 
 - [OKF Bundle Maintenance](okf-maintenance.md) — How to keep your bundle from rotting.
 - [Root Index](/index.md) — This bundle's structure and navigation.
+
+# Citations
+
+- [GoogleCloudPlatform/open-knowledge-format](https://github.com/GoogleCloudPlatform/open-knowledge-format)
+  — upstream repository: the v0.1 specification this page summarizes and `SPEC.md` for v0.2
+  (read 2026-10-19).