diff --git a/help.md b/help.md
index 84608b4..3a22cc3 100644
--- a/help.md
+++ b/help.md
@@ -296,6 +296,8 @@
 | `:%s/$/test/`        | 在行尾加入特定字符(也可以用宏录制来添加)         |
 | `:sort`              | 排序                                             |
 | `:g/^\(.\+\)$\n\1/d` | 去除重复行(先排序)                               |
+| `:%s/^.\{10\}//`     | 删除每行前10个字符                               |
+| `:%s/.\{10\}$//`     | 删除每行尾10个字符                               |
 
 
 ## 帮助