diff --git a/client/src/mobile/screens/trip/places/placesBrowserModel.ts b/client/src/mobile/screens/trip/places/placesBrowserModel.ts
index 3fc6aceaf..851f0fe0f 100644
--- a/client/src/mobile/screens/trip/places/placesBrowserModel.ts
+++ b/client/src/mobile/screens/trip/places/placesBrowserModel.ts
@@ -12,8 +12,9 @@ import {
  * Pure filter model of the mobile places browser. Mirrors the desktop
  * sidebar's semantics exactly (usePlacesSidebar + the map's mapPlaces memo):
  * the pool filter, the category set and the rating floor come from the trip
- * store and go through the same matcher (utils/placesFilter), so the list here
- * and the map markers always agree (#1541).
+ * store and go through the same matcher (utils/placesFilter) as the map markers
+ * (#1541); the map's own exceptions (open day, collapsed days) are described
+ * there.
  */
 
 /** Kept under this name for the browser's callers; the predicate itself lives in utils/placesFilter. */
diff --git a/client/src/utils/placesFilter.ts b/client/src/utils/placesFilter.ts
index 99196ea14..a4fce60c9 100644
--- a/client/src/utils/placesFilter.ts
+++ b/client/src/utils/placesFilter.ts
@@ -3,9 +3,11 @@ import type { Place } from '../types'
 /**
  * The trip's places filter, in one place: the pool (all / unplanned / planned /
  * tracks), the category set and the minimum rating. The desktop list, the phone
- * list and the map markers of both shells all filter through these helpers, on
- * the values held in the trip store, so the list and the map can never disagree
- * on which places are in view (#1541).
+ * list and the map markers of both shells apply this same predicate to the same
+ * values, held in the trip store (#1541). The map keeps two deliberate
+ * differences of its own: with a day open, "planned" shows that day's plan only
+ * (#2024), and the stops of collapsed days are left off the map (except under
+ * "planned").
  */
 
 /** A minimum of average stars: 'all', or a floor that unrated places fall through. */