What is the difference between a rider and

[bobs barricade tester]

What are the definition of a rider and a supplement?
Is one a change and the other an addition?

 

[SnowCitizen]

Supplements add to and/or supercede the Master.
They cover a large region (10+ states)

Riders add to and/or supercede the Master and the Supplement.
They can cover a city, small area, state, or a few states.

 

[bobs barricade tester]

thanks