diff --git a/CLAUDE.md b/CLAUDE.md
index 5777af9..7967db4 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -34,7 +34,7 @@ The site is structured around Trip entities. Key facts:
 - Each trip has two content subfolders: `01.dailies/` (journal entries) and `04.stories/` (stories). The former `02.map/` and `03.stats/` standalone views were **removed** (2026-07-04, see `docs/working/plans/2026-07-04-standalone-page-cleanup.md`) — map and stats now render inline on the trip page
 - `01.dailies/` and `04.stories/` are `routable:false` **data containers** — visiting `/trips/<slug>/dailies` or `/stories` directly 404s/redirects; their children (entries/stories) render at their own detail URLs and are aggregated by the trip page
 - Site nav in `base.html.twig` has Home + Past Trips only — does not link to trip sub-sections
-- Post form parent (`post-form.md` → `pageconfig.parent`) **must be kept in sync** with `active_trip`
+- New journal entries are written to the active trip's `dailies` — the write target is derived from `site.active_trip` at submit time by the `cache-on-save` plugin (post-form.md no longer hardcodes `pageconfig.parent`)
 - The trip page (`trip.html.twig`) uses a **client-side filter bar** (All content / Journal / Stories). The standalone `/dailies`, `/map`, `/stats`, `/stories` view pages no longer exist — do NOT try to re-create them or link to them. This filter bar + stats chrome is shared with the home active-trip view via the `trip-feed-col` partial (see "Shared trip-feed-col partial" below)
 - Stats are shown inline on the trip page via a toggle (the standalone `/stats` view was removed)
 - GPX route files live as media on the trip page itself, parsed client-side via toGeoJSON (bundled into `js/map.js`) and drawn on the trip/home map
@@ -113,12 +113,11 @@ To add GPX files without the browser UI, drop them directly into `user/pages/01.
 
 ### Switching to a new trip
 
-Two places hardcode the active trip slug. Grav's config and page frontmatter are static YAML — no variable substitution is possible, so these cannot read from `site.yaml` automatically. **Both must be updated together** when starting a new trip, or entries will be posted to the wrong folder.
+The active trip lives in **one** place now: `site.active_trip`. The post form no longer hardcodes a `pageconfig.parent` — the `cache-on-save` plugin derives the write target from `site.active_trip` at submit time (`onFormValidationProcessed` → `setData('parent', …)`), so there is nothing to keep in sync.
 
-| File | Key | Example value |
-|---|---|---|
-| `user/config/site.yaml` | `active_trip` | `italy-2027` |
-| `user/pages/02.post/post-form.md` | `pageconfig.parent` | `/trips/italy-2027/dailies` |
+| File | Key | Example value | How to edit |
+|---|---|---|---|
+| `user/config/site.yaml` | `active_trip` | `/trips/italy-2027` | Admin → Configuration → Site → **Active Trip** (page-picker rooted at `/trips`; blueprint at `user/blueprints/config/site.yaml`) |
 
 Note: `system.yaml` `home.alias` is permanently set to `/home` (the real home page) and does **not** need to change when switching trips.