La. Civ. Code art. 2054
Current with operative changes from the 2024 Third Special Legislative Session
When the parties made no provision for a particular situation, it must be assumed that they intended to bind themselves not only to the express provisions of the contract, but also to whatever the law, equity, or usage regards as implied in a contract of that kind or necessary for the contract to achieve its purpose.
La. C.C. § 2054