diff --git a/apps/web/app/projects/[id]/write/page.tsx b/apps/web/app/projects/[id]/write/page.tsx
index a481539..77f8b23 100644
--- a/apps/web/app/projects/[id]/write/page.tsx
+++ b/apps/web/app/projects/[id]/write/page.tsx
@@ -43,7 +43,10 @@ export default async function WritePage({ params, searchParams }: PageProps) {
   }));
 
   return (
+    // key=章号：客户端切章（?chapter=N 变化）时强制重挂载，用新章草稿刷新编辑器状态，
+    // 避免 Workbench 内 useState(initialText)/autosave 基线沿用上一章而显示旧内容。
     <Workbench
+      key={chapterNo}
       project={project}
       chapterNo={chapterNo}
       initialText={initialText}