Fixed docker exec note

README.md

@@ -27,7 +27,7 @@ For a more complex example, refer to the [`docker-compose.yml`](docker-compose.y
 
 You can also **extend** this image to create your own custom unprivileged user, and then leverage the `--user` Docker option to run the container as such.
 
-> **Note**: even if the container is running as an unprivileged user, you can still use `docker exec -ituroot bash` to run commands as root inside it.
+> **Note**: even if the container is running as an unprivileged user, you can still use `docker exec -ituroot mycontainer bash` to run commands as root inside it.
 
 ## More info