The era of indirect detection searches for dark matter has begun. The sensitivities reached by gamma-rays searches now enable to probe the relevant parameter space of weakly interacting
massive particles (WIMPs). Gamma ray lines would be smoking gun signatures of Dark Matter annihilation although they are typically suppressed compared to the continuum spectrum. I will present prospects for generic classes of models in which WIMPs can naturally lead to gamma ray lines that are relatively enhanced compared to the continuum. I will present a detailed computation of the 1-loop continuum which has been overlooked so far in earlier
studies but is un unavoidable component to take into account for a careful prediction of gamma ray line signatures. I will also discuss constraints from the relic abundance, direct
detection and collider bounds.
