diff --git a/tool.md b/tool.md
index 131dc85..e46c019 100644
--- a/tool.md
+++ b/tool.md
@@ -23,4 +23,6 @@
 
 - __`ssh-copy-id` 公私钥快捷上传工具__ 
 
-- __`tldr` 命令简化说明__ 
\ No newline at end of file
+- __`tldr` 命令简化说明__ 
+
+- __`htop` top 命令的升级版__ 
\ No newline at end of file