Correct file path in example command and add note to highlight it.

Author: Frodo Podschwadek

README.md

@@ -29,9 +29,11 @@ For now, there's only one measly example but more (for more complex cases) will
 Here, CATPOD uses the [test playbook](https://github.com/fpodschwadek/catpod/blob/main/test.yml) to create a container from the Docker `hello-world` image remove itself when done.
 
 ```bash
-docker run -it -v /var/run/docker.sock:/var/run/docker.sock -v ./test.yml:/tmp/test.yml --rm fpod/catpod test.yml
+docker run -it -v /var/run/docker.sock:/var/run/docker.sock -v ./test.yml:/tmp/test.yml --rm fpod/catpod /tmp/test.yml
 ```
 
+Note that the file path used at the end of this command refers to the path inside the CATPOD container the file was mounted to, in this case `/tmp/text/yml`.
+
 ## Vault
 
 You can use CATPOD to encrypt data with Ansible Vault by using the `vault` followed by anything you would use with locally installed `ansbile-vault`. For example, you can use the following command to encrypt a string: