The XENON100 limit (90% C.L.) on ALP coupling to electrons as a function of the mass, under the assumption that ALPs constitute all the dark matter in our Galaxy (blue line). The expected sensitivity is shown by the green/yellow bands (). The other curves are constraints set by CoGeNT [1] (light brown dashed line), CDMS [2] (blue dashed line), and EDELWEISS-II [3] (brown dashed line). The indirect astrophysical bound from solar neutrinos [4] is represented as a continous light gray line. The benchmark Kim-Shifman-Vainshtein-Zakharov (KSVZ) model is represented by a black line [5, 6].