[ULPIANUS libro primo responsorum. ] §22.1.31.prQuod in stipulatione sic adiectum est: 'et usuras, si quae competierint', nullius esse momenti, si modus certus non adiciatur.
What has been added to a stipulation in this way: 'and interest, if any should accrue', is of no validity, if a specific rate is not added.