  We describe the implementation of a new module which can be used to simulate
physical systems in which the motion of particles is affected by stochastic
forces. Such forces are expected to be present in turbulent circumstellar disks
or remnant planetesimal disks. Our implementation offers a convenient way to
generate correlated noise with a user-specified amplitude and auto-correlation
time for each particle. The module has minimal memory requirements and is
freely available within the REBOUNDx additional effects library.
