diff --git a/femap/site/index.html b/femap/site/index.html
index aa1a8ee..27ce756 100644
--- a/femap/site/index.html
+++ b/femap/site/index.html
@@ -197,6 +197,7 @@ footer{padding-block:18px 30px;color:var(--faint);font-size:13px}
     </table>
     <div class="hist"><span>Map distance ÷ timed length, every flight</span><canvas id="hist" aria-label="Histogram of map distance divided by timed length"></canvas></div>
     <div><h2 style="margin-bottom:6px">Farthest out</h2><ul class="worst" id="worst"></ul></div>
+    <p class="note" id="flnote" hidden>Flight times are off, so every remaining measurement is a maximum distance. Any flat map drawn small enough meets them all, so a score of 0 here says nothing about the shape. The triangles do not depend on the layout.</p>
     <p class="note" id="globenote">Globe: the same rules applied to great-circle distances on a sphere of radius 6,371 km.</p>
   </aside>
 </section>
@@ -488,6 +489,7 @@ function globeScore() {
 let SC = null, GS = null;
 function update(full) {
   SC = score(sv.X, 2); if (full) GS = globeScore();
+  $("#flnote").hidden = S.fl;
   const nAct = { rt: act.l.filter(l => l.kind === "rt").length, rr: act.l.filter(l => l.kind === "rail" || l.kind === "road").length, sat: act.l.filter(l => l.kind === "sat").length };
   const row = (label, a, b, n, cls) => `<tr><th scope="row">${label}</th><td class="${a ? cls : "ok"}">${fmt(a)}<span class="of"> / ${fmt(n)}</span></td><td class="${b ? cls : "ok"}">${fmt(b)}</td></tr>`;
   const nf = S.fl ? FL.length : 0;
diff --git a/femap/template.html b/femap/template.html
index 151fa12..2b5c6a6 100644
--- a/femap/template.html
+++ b/femap/template.html
@@ -197,6 +197,7 @@ footer{padding-block:18px 30px;color:var(--faint);font-size:13px}
     </table>
     <div class="hist"><span>Map distance ÷ timed length, every flight</span><canvas id="hist" aria-label="Histogram of map distance divided by timed length"></canvas></div>
     <div><h2 style="margin-bottom:6px">Farthest out</h2><ul class="worst" id="worst"></ul></div>
+    <p class="note" id="flnote" hidden>Flight times are off, so every remaining measurement is a maximum distance. Any flat map drawn small enough meets them all, so a score of 0 here says nothing about the shape. The triangles do not depend on the layout.</p>
     <p class="note" id="globenote">Globe: the same rules applied to great-circle distances on a sphere of radius 6,371 km.</p>
   </aside>
 </section>
@@ -488,6 +489,7 @@ function globeScore() {
 let SC = null, GS = null;
 function update(full) {
   SC = score(sv.X, 2); if (full) GS = globeScore();
+  $("#flnote").hidden = S.fl;
   const nAct = { rt: act.l.filter(l => l.kind === "rt").length, rr: act.l.filter(l => l.kind === "rail" || l.kind === "road").length, sat: act.l.filter(l => l.kind === "sat").length };
   const row = (label, a, b, n, cls) => `<tr><th scope="row">${label}</th><td class="${a ? cls : "ok"}">${fmt(a)}<span class="of"> / ${fmt(n)}</span></td><td class="${b ? cls : "ok"}">${fmt(b)}</td></tr>`;
   const nf = S.fl ? FL.length : 0;
diff --git a/tests/femap.mjs b/tests/femap.mjs
index ac77b76..190c777 100644
--- a/tests/femap.mjs
+++ b/tests/femap.mjs
@@ -70,7 +70,9 @@ await p.waitForFunction(() => /^Done/.test(document.getElementById('status').tex
 const kf = await broken();
 console.log('Limits only: broken', kf);
 if (kf > 5) fail('limits alone should be (nearly) satisfiable on a plane', kf);
+if (await p.evaluate(() => document.getElementById('flnote').hidden)) fail('flight-times-off note not shown');
 await p.click('#d-fl');
+if (!(await p.evaluate(() => document.getElementById('flnote').hidden))) fail('flight-times-off note still shown');
 await p.click('#starts button[data-start="best"]');
 await p.waitForTimeout(300);
 // 3D release