Supererogation
Supererogation (Late Latin: supererogatio "payment beyond what is needed or asked", from super "beyond" and erogare "to pay out, expend", itself from ex "out" and rogare "to ask") is the performance of more than is asked for; the action of doing more than duty requires. In ethics, an act is supererogatory if it is good but not morally required to be done.