diff --git a/README.md b/README.md
index 72366ce..7e7ddad 100644
--- a/README.md
+++ b/README.md
@@ -45,8 +45,8 @@ See the [action.yml](./action.yml) file for more detail information.
 * command_timeout - timeout for scp command, default is `10m`
 * key - content of ssh private key. ex raw content of ~/.ssh/id_rsa
 * key_path - path of ssh private key
-* target - target path on the server
-* source - scp file list
+* target - target path on the server, must be a directory (**required**)
+* source - scp file list (**required**)
 * rm - remove target folder before upload data, default is `false`
 * strip_components - remove the specified number of leading path elements.
 * overwrite - use `--overwrite` flag with tar, overwrite existing files when extracting
diff --git a/action.yml b/action.yml
index 5ecab88..a322c3d 100644
--- a/action.yml
+++ b/action.yml
@@ -29,7 +29,7 @@ inputs:
     description: 'include more ciphers with use_insecure_cipher'
     default: false
   target:
-    description: 'target path on the server'
+    description: 'target path on the server, must be a directory path.'
   source:
     description: 'scp file list'
   rm: