Cosmological constraints on neutrino plus axion hot dark matter: update after WMAP-5

We update our previous constraints on two-component hot dark matter (axions and neutrinos), including the recent WMAP five-year data release. Marginalizing over Sigma m(nu) provides m(a) < 1.02 eV (95% C. L.) for the axion mass. In the absence of axions we find Sigma m(nu) < 0.63 eV (95% C. L.).