diff --git a/CHANGELOG.md b/CHANGELOG.md
index 388fef02..afb7af2b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -125,10 +125,14 @@ auto-generated per-PR notes; this file is the curated, human-readable history.
   **Saved Dashboard variable values are untouched.** The localStorage key stays
   `asb:dashFilters`, keeping its historical name deliberately: renaming it would
   have discarded every committed value on the next load. `asb:filterActive` and
-  its helpers keep their names too — they are the Workbench's optional-block
-  activation, not Dashboard variables. Both exceptions are documented where they
-  live, and a new test pins every persisted key string so a future rename cannot
-  orphan real data while the suite stays green.
+  its helpers keep their names too — what they denote is activation of a
+  parameter's optional `/*[ … ]*/` filter block, a live SQL-filter concept that
+  predates the curated Dashboard model and outlived it, and that key is persisted
+  as well. (The shared variable-bar port also exposes that name to its Dashboard
+  caller, where nothing is persisted behind it; that leaky abstraction is #478,
+  deliberately not folded into a rename.) Both exceptions are documented where
+  they live, and a new test pins every persisted key string so a future rename
+  cannot orphan real data while the suite stays green.
 
 - **Dashboard variable option SQL is edited in the main editor, as its own tab**
   (#457). Clicking a variable in the Dashboards tree switches to Query and opens
diff --git a/docs/ADR-0003-dashboard-viewing.md b/docs/ADR-0003-dashboard-viewing.md
index 1cead524..208d0b9c 100644
--- a/docs/ADR-0003-dashboard-viewing.md
+++ b/docs/ADR-0003-dashboard-viewing.md
@@ -513,10 +513,31 @@ unchanged. Three decisions are worth recording.
   of them silently on the next load, and a read-old/write-new migration is a
   behaviour change in a change whose whole contract is "no behaviour change". The
   property name deliberately still matches the key string so the two cannot
-  drift. `state.filterActive`/`asb:filterActive` (and `saveFilterActive`/
-  `effectiveFilterActive`) are the second exception, for a different reason: they
-  name the WORKBENCH's optional-block activation map — a live concept that is not
-  a Dashboard variable at all — and are likewise persisted.
+  drift.
+
+- **`filterActive` stays, and the reason is narrower than "it's the Workbench's".**
+  `state.filterActive`/`asb:filterActive`/`saveFilterActive`/
+  `effectiveFilterActive` keep their names because what they name is *activation
+  of a parameter's optional `/*[ … ]*/` filter block* — `variable-bar.ts`'s
+  `app.state.filterActive[p.name] = input.value !== ''` is exactly that — which is
+  a live SQL-filter concept that predates the curated Dashboard model and survived
+  its removal. The key is persisted besides.
+
+  What that argument does **not** cover, and an earlier draft of this addendum
+  wrongly implied it did: `VariableBarApp` — the SHARED port both the Dashboard and
+  the detached Data view build the bar through — also declares `state.filterActive`
+  and `params.saveFilterActive`, and the Dashboard satisfies it with a purely local
+  `draftActive` map and a **no-op** `saveFilterActive`. So one of the port's two
+  callers has no Workbench state and nothing persisted behind that name. The
+  concept is still optional-block activation in both callers, so this is a leaky
+  abstraction rather than a surviving curated-filter name — but naming a shared
+  port after one caller's persisted field is worth fixing on its own terms, not
+  inside a rename. Deferred to #478 deliberately: `params` is a
+  `Pick<WorkbenchParameterSession, …>` (renaming a member stops it being a Pick,
+  so the detached caller can no longer pass the app straight through), and the bar
+  MUTATES the caller's map in place before calling `saveFilterActive()` — an
+  adapter that copies instead of aliasing would silently stop persisting
+  activation in the detached view, with no test today that would fail.
 
 - **The rename is unfalsifiable by construction, so two guards were added.** A
   pure rename passes its whole suite whether or not it is correct, and every
diff --git a/src/ui/dashboard.ts b/src/ui/dashboard.ts
index d3ae241a..e4bbb92b 100644
--- a/src/ui/dashboard.ts
+++ b/src/ui/dashboard.ts
@@ -749,7 +749,7 @@ export async function renderDashboard(
   const ordinaryTimeIds = new Set(session.timeRangeGroups.flatMap((group) =>
     [group.fromVariableId, group.toVariableId]));
   const ordinaryVariableIds = session.state.value.variableStates
-    .filter((filter) => !ordinaryTimeIds.has(filter.id)).map((filter) => filter.id);
+    .filter((variable) => !ordinaryTimeIds.has(variable.id)).map((variable) => variable.id);
   const clearVariablesBtn = h('button', {
     class: 'dash-clear-variables', type: 'button', disabled: true,
     onclick: () => { void session.resetVariables(ordinaryVariableIds); },