diff --git a/command/tree.md b/command/tree.md
index f47cebbedb..7f47b19152 100644
--- a/command/tree.md
+++ b/command/tree.md
@@ -106,4 +106,17 @@ tree -L 2 > /home/www/tree.txt # 当前目录结果存到 tree.txt 文件中
 tree -I 'node_modules|icon|font' -L 2
 ```
 
+非树状结构列出目录`/private/`下的所有文件
+
+```
+tree -if /private/
+/private
+/private/a1
+/private/a2
+/private/etc
+/private/etc/b1
+/private/etc/b2
+/private/tftpboot
+```
+
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