  Transport of angular momentum is a long-standing problem in stellar physics
which recently became more acute thanks to the observations of the space-borne
mission \emph{Kepler}. Indeed, the need for an efficient mechanism able to
explain the rotation profile of low-mass stars has been emphasized by
asteroseimology and waves are among the potential candidates to do so. In this
article, our objective is not to review all the literature related to the
transport of angular momentum by waves but rather to emphasize the way it is to
be computed in stellar models. We stress that to model wave transport of
angular momentum is a non-trivial issue that requires to properly account for
interactions between meridional circulation and waves. Also, while many authors
only considered the effect of the wave momentum flux in the mean momentum
equation, we show that this is an incomplete picture that prevents from
grasping the main physics of the problem. We thus present the Transform
Eulerian Formalism (TEM) which enable to properly address the problem.
