Voyager 2 did indeed discover new moons and rings around Neptune during its flyby in 1989.
* Moons: Voyager 2 discovered six new moons of Neptune: Despina, Galatea, Larissa, Naiad, Proteus, and Thalassa.
* Rings: Voyager 2 confirmed the existence of Neptune's faint ring system, which had been previously detected by ground-based telescopes. It also revealed that the rings are actually made up of several distinct arcs.
So yes, Voyager 2 made significant discoveries about Neptune's moons and rings in 1989.
