ag.algebraic geometry – Descendent Gromov-Witten invariants and Frobenius manifolds

I’ve heard it said that genus $0$ descendent Gromov-Witten invariants of a smooth projective variety $X$ can be encoded in the structure of a Frobenius manifold on the cohomology $H^*(X,mathbb{C)}$. I am very confused by this – it is clear that this is true for non-descendent Gromov-Witten invariants. How do the descendent invariants enter in?