diff --git a/docs/demo-script.md b/docs/demo-script.md
index b457be5..7874781 100644
--- a/docs/demo-script.md
+++ b/docs/demo-script.md
@@ -168,3 +168,32 @@ curl -fsS http://localhost:8120/register | jq 'length'  # → unchanged
 
 > `bsn` / `naam_placeholder` are deferred (ADR-0008) — the notification doesn't carry them and
 > the subscriber may not read OpenZaak directly (§8.1). They surface in a later slice.
+
+---
+
+## S-09 — Openbaar Register portal (public visibility)
+
+**Outcome:** the entry a zorgprofessional submits via self-service becomes publicly visible in the
+anonymous openbaar register portal — closing the walking-skeleton loop (submit → process → projection
+→ public visibility).
+
+**The path:** self-service submit → BFF → domain → (zaak) OpenZaak → NRC → Event Subscriber →
+projection → openbaar portal reads the BFF's public-safe `GET /openbaar/register`.
+
+```bash
+# 1. Bring the full stack up (self-service :8140, openbaar :8141).
+make up
+
+# 2. Submit a registration via the self-service portal (mock DigiD: jan-burger / test123),
+#    or drive the whole happy path automatically (login → submit → public visibility):
+make verify-e2e
+
+# 3. Open the public register — no login. It lists the submitted entry (id + status only).
+#    Only public-safe fields cross the BFF: bsn / naam never appear.
+open http://localhost:8141/            # search box; searches the BFF by referentie
+curl -fsS http://localhost:8140/openbaar/register | jq   # same public-safe view via the BFF proxy
+# → [ { "id": "<zaak-uuid>", "status": "INGEDIEND" } ]
+```
+
+> The register shows `INGEDIEND` entries today; the approval transition to a terminal status
+> (e.g. `INGESCHREVEN`) lands with the approval flow (S-09b, #75).
diff --git a/docs/frontend-decisions.md b/docs/frontend-decisions.md
index 88ad7fb..19c65e9 100644
--- a/docs/frontend-decisions.md
+++ b/docs/frontend-decisions.md
@@ -103,3 +103,17 @@ with the submit form (S-08c, #67); any deviation from NL DS will be recorded her
   touching the app or its production config.
 - `tests/e2e` is a standalone Playwright project (its own `package.json`), not an Nx project — it's a
   live-stack check like the other `verify-*` runners, not part of the `frontend` unit lane.
+
+## Openbaar Register portal (S-09, #10)
+
+- **Anonymous, no auth.** The openbaar register is a public read, so `apps/openbaar` has no
+  `angular-auth-oidc-client`, no interceptor, and no `config.json` — `main.ts` bootstraps `appConfig`
+  directly with just `provideHttpClient` + `provideRouter`. This is the deliberate contrast to
+  self-service and keeps the app trivially cacheable/CDN-able.
+- **Same-origin via nginx, like self-service.** The compose `openbaar` image serves the built app and
+  reverse-proxies `/openbaar` to the BFF; the api-client's relative calls stay same-origin (no CORS).
+  Served on `:8141`, health-checked over IPv4 (`127.0.0.1`), no Keycloak dependency.
+- **Public-safe by construction.** The portal only ever sees the BFF's `OpenbaarProjection.PublicView`
+  (id + status); `bsn`/`naam` never leave the BFF. The e2e asserts the bsn never renders.
+- **Loads on open, filters on search.** `RegisterPage` fetches the full register on construction and
+  re-queries `/openbaar/register?q=` on search — no client-side filtering, the BFF owns the query.