diff --git a/faq/index.html b/faq/index.html
index 168b827..215ee38 100644
--- a/faq/index.html
+++ b/faq/index.html
@@ -237,6 +237,13 @@ if (langBox) {
     applyLang();
   });
 }
+// Accordion: only one answer open at a time
+el('list').addEventListener('toggle', (ev) => {
+  const d = ev.target;
+  if (!d || d.tagName !== 'DETAILS' || !d.open) return;
+  el('list').querySelectorAll('details[open]').forEach(o => { if (o !== d) o.open = false; });
+}, true);
+
 el('q').addEventListener('input', render);
 
 applyLang();