diff --git a/docs/zh/guide/cell.md b/docs/zh/guide/cell.md
index ae9326e..78bd3a1 100644
--- a/docs/zh/guide/cell.md
+++ b/docs/zh/guide/cell.md
@@ -73,6 +73,13 @@
         <td>0 常规 、 1 删除线</td>
         <td>Style.Font object's Underline property</td>
     </tr>
+    <tr>
+        <td>un</td>
+        <td>underline</td>
+        <td>下划线</td>
+        <td>0 无 、 1 有</td>
+        <td></td>
+    </tr>
     <tr>
         <td>vt</td>
         <td>verticaltype</td>