diff --git a/static/index.html b/static/index.html
index 1963c1ee..7eae1491 100644
--- a/static/index.html
+++ b/static/index.html
@@ -2890,6 +2890,29 @@ async function runStrategyBacktest(version) {
   }
 }
 
+function showDesc(version) {
+  // 2026-08-18 补回（commit 9f1185fc 误删导致📖按钮失效）
+  const s = (window._strats || []).find(x => x.version === version);
+  const d = s && s.description;
+  if (!d || !d.title) { alert('暂无说明'); return; }
+  // 用模态框展示说明（替代旧 alert，含进化说明）
+  const evoRows = (window._evolutionHistory || []).filter(e => e.child_version === version || e.parent_version === version);
+  let evoHtml = '';
+  if (evoRows.length) {
+    evoHtml = '\n\n【进化来源】\n' + evoRows.map(e =>
+      (e.parent_version || '?') + ' → ' + (e.child_version || version) +
+      (e.change_description ? '：' + e.change_description : '')).join('\n');
+  }
+  const text = ['【' + d.title + '】', '【算法】' + (d.algorithm || ''), '【思路】' + (d.rationale || ''), '【证据】' + (d.evidence || '')].join('\n\n') + evoHtml;
+  const el = document.getElementById('desc-modal');
+  if (el) {
+    el.querySelector('.modal-body').innerHTML = text.replace(/\n/g, '<br>');
+    el.classList.remove('hidden');
+  } else {
+    alert(text);
+  }
+}
+
 async function showStrategyDetail(version) {
   const detail = document.getElementById('strategyDetail');
   detail.innerHTML = '<div class="text-slate-500 text-sm">加载 ' + version + ' 明细...</div>';