update README

README.md

@@ -33,13 +33,13 @@ docker compose up -d
 Then access http://localhost:3333/s3.
 
 # Usage
-## Upload file/directory
+## Upload file/directory manually
 You can upload files using the "New File" button at the top right of the screen.  
 To upload directories, create them in the directory mounted to `/app/upload` using commands like `mkdir`.
 
 ![New File button](static/newfile.png)
 
-## Remove file/directory
+## Remove file/directory manually
 The feature to delete files and directories from the web interface is currently under development.  
 For now, you can use commands like `rm` in the directory mounted to `/app/upload` to delete them.