2nd config file not working

Hi guys,
I've decided to create a second configuration file for my plugin in order to store some data about the users of my server.
I'd like to store it in the following format:

players.yml​

Code:

Pitazzo:
  - Bastiv|James Smith
  - Retro|Loius Clarck
Touretes:
  - Bastiv|Agent X
  - Elien|Mr. Y
  - Pitazzo|Henry

The point, in order to do that, and as far as I know, would be this:
First, create the file jugadores.yml if it doesn't exist and make it accesible with the Bukkit Config API

Code:java

    public File jugadores;
    public static FileConfiguration JugadoresConfig;   
 
 
public void loadJugadoresFile() {
        jugadores = new File(getDataFolder(), "jugadores.yml");
        if (!jugadores.exists()) {
            try {
                jugadores.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        JugadoresConfig = YamlConfiguration.loadConfiguration(jugadores);
    }

And then just accesing it:

1. In case the player wasn't in the file yet:

Code:java

            List<String> conocidos = new ArrayList<String>();
            conocidos.add("Bastiv|Agente X");
            Main.JugadoresConfig.set(player.getName(), conocidos);

2. In case it already was:

Code:java

    List<String> conocidos = (List<String>) Main.JugadoresConfig.getList(player.getName());
            conocidos.add("Bastiv|agent X");
            Main.JugadoresConfig.set(player.getName(), conocidos);

But for some reason, when I try to add some new text to the config it doesn't work, without any error. Moreover, I'm able to read the existant strinngs in the list.

Any help will be appreciated

 

Do you ever tell the config to save to the file?