diff --git a/demo/golden/matrix.mjs b/demo/golden/matrix.mjs
index 3fde57f5..0c0ca6a7 100644
--- a/demo/golden/matrix.mjs
+++ b/demo/golden/matrix.mjs
@@ -224,6 +224,7 @@ export const GOLDEN_SCENARIOS = Object.freeze([
     theme: 'light', viewport: { width: 1000, height: 900 }, ...stage },
   { id: 'vacuum-trail-smoothing-dark', fixture: 'visual', space: 'golden-geometry', mode: 'view',
     vacuumTrail: {
+      maxDeviationCm: 17.5,
       current: [
         [[180, 220], [360, 220], [360, 420], [520, 420]],
         [[650, 240], [780, 240], [780, 500], [650, 620], [850, 760]],
diff --git a/test/golden-matrix.test.mjs b/test/golden-matrix.test.mjs
index 323c926d..4331da42 100644
--- a/test/golden-matrix.test.mjs
+++ b/test/golden-matrix.test.mjs
@@ -394,6 +394,7 @@ test('vacuum smoothing golden covers current gaps and the previous run', () => {
   const scenario = GOLDEN_SCENARIOS.find((item) => item.id === 'vacuum-trail-smoothing-dark');
   assert.ok(scenario);
   assert.equal(scenario.mode, 'view');
+  assert.equal(scenario.vacuumTrail?.maxDeviationCm, 17.5);
   assert.equal(scenario.vacuumTrail?.current.length, 2);
   assert.equal(scenario.vacuumTrail?.current.flat().length >= 8, true);
   assert.equal(scenario.vacuumTrail?.previous.length >= 4, true);