An existing legal obligation resting upon the promisor, a moral obligation originating in some benefit conferred upon the promisor, or prejudice suffered by the promisee is also a good consideration for a promise to an extent corresponding with the extent of the obligation, but no further or otherwise.
Mont. Code Ann. § 28-2-802
Extent to which existing legal or moral obligation is good consideration
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.