def command_result_processor_parameter_extra(parameter_values):
    """
    Command result message processor if received extra parameter(s).
    
    Parameters
    ----------
    parameter_values : `str`
        Extra parameters.
    
    Returns
    -------
    message : `str`
    """
    message_parts = []
    
    message_parts.append('Extra parameters: ')
    
    index = 0
    limit = len(parameter_values)
    
    while True:
        parameter_value = parameter_values[index]
        index += 1
        
        message_parts.append(repr(parameter_value))
        
        if index == limit:
            break
        
        message_parts.append(', ')
        continue
    
    message_parts.append('.\n')
    
    return ''.join(message_parts)