  We investigate the resonant rotation of circumbinary bodies in planar
quasi-circular orbits. Denoting $n_b$ and $n$ the orbital mean motion of the
inner binary and of the circumbinary body, respectively, we show that
spin-orbit resonances exist at the frequencies $n\pm k\nu/2$, where $\nu = n_b
- n$, and $k$ is an integer. Moreover, when the libration at natural frequency
has the same magnitude as $\nu$, the resonances overlap and the rotation
becomes chaotic. We apply these results to the small satellites in the
Pluto-Charon system, and conclude that their rotations are likely chaotic.
However, the rotation can also be stable and not synchronous for small axial
asymmetries.
