Security is not presumed; it must be express and cannot be extended further than that specified therein.\nIf it be simple and indefinite it shall include not only the principal obligation but all its accessories, including the costs of the suit, it being understood, with regard to the latter, that the surety shall only be liable for those incurred after he has been asked to pay.\nHistory —Civil Code, 1930, § 1726.
Puerto Rico Legal Code