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The $\eta$-$\eta^\prime$ pseudoscalar mixing angle and the gluonium contentof the $\eta^\prime$ meson are deduced from an updated phenomenologicalanalysis of $J/\psi$ decays into a vector and a pseudoscalar meson. In absenceof gluonium, the value of the mixing angle in the quark-flavour basis is foundto be $\phi_P=(40.7\pm 2.3)^\circ$. In presence of gluonium, the values for themixing angle and the gluonic content of the $\eta^\prime$ wave function are$\phi_P=(44.6\pm 4.4)^\circ$ and $Z^2_{\eta^\prime}=0.29^{+0.18}_{-0.26}$,respectively. The newly reported values of $B(J/\psi\to\rho\pi)$ by the BABARand BES Collaborations are crucial to get a consistent description of data.

J/psi->VP decays and the quark and gluon content of the eta and eta'