A rider on a bill is an additional provision added to a bill or other measure under consideration by a legislature, which may or may not have much, if any, connection with the subject matter of the bill). Riders are often used to introduce unpopular provisions that may not pass on their own, and they can be added to bills in two forms: as strings attached to appropriations bills that must become law, or as amendments to a law or new law that is attached onto a bill but is not directly related to that bill). Riders are not permitted in legislatures bound by a single-subject rule). In the legislative context, a rider is an informal term for a nongermane amendment to a bill or an amendment to an appropriation bill that changes the permanent law governing a program funded by the bill. Riders can be found at both the federal and state levels of government).