private void updatePlayerList() {
		final StringBuilder sb = new StringBuilder();
		for (String c : registeredClients) {
			sb.append(c);
			sb.append(System.lineSeparator());
		}

		if (registeredClients.size() == 0) {
			if (isJoinable())
				sb.append("Waiting for players...");
			else
				sb.append("No players!");

			if (!btnPlay.isSelected())
				btnPlay.setEnabled(false);
		} else {
			btnPlay.setEnabled(true);
		}
		txtPlayers.setText(sb.toString());
	}