diff --git a/content/Prompt Engineering/4. 文本概括 Summarizing.ipynb b/content/Prompt Engineering/4. 文本概括 Summarizing.ipynb
index 74f9173..c1a32ff 100644
--- a/content/Prompt Engineering/4. 文本概括 Summarizing.ipynb	
+++ b/content/Prompt Engineering/4. 文本概括 Summarizing.ipynb	
@@ -20,7 +20,7 @@
     "     <li>\n",
     "         <span><a href=\"#二单一文本概括\" data-toc-modified-id=\"二、单一文本概括实验\">二、单一文本概括实验</a></span>\n",
     "         <ul class=\"toc-item\">\n",
-    "             <li><span><a href=\"#21-限制输出文本长度\" data-toc-modified-id=\"2.1 限制输出文本长度\">2.1 限制输出文本长度</a></span></li   \n",
+    "             <li><span><a href=\"#21-限制输出文本长度\" data-toc-modified-id=\"2.1 限制输出文本长度\">2.1 限制输出文本长度</a></span></li> \n",
     "             <li><span><a href=\"#22-设置关键角度侧重\" data-toc-modified-id=\"2.2 设置关键角度侧重\">2.2 设置关键角度侧重</a></span></li>\n",
     "             <li><span><a href=\"#23-关键信息提取\" data-toc-modified-id=\"2.3 关键信息提取\">2.3 关键信息提取</a></span></li>\n",
     "             </ul>\n",