English translation: voluntary additional compensation
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La mejora voluntaria: voluntary compensation in addition to the usual salary; it is an improvement or increase of salary made by employer, as opposed to an additional compensation established by Law. See my comment below, please.
Exactly - the Base Salary, Voluntary Additional Bequest in a Will the can be compensated ..., ... In other words, apparently the compensation includes a voluntary bequest to the employee's will if he/she were to die. At least this is my understanding.