There has been recent progress towards the understanding of string corrections to 4pt-correlation functions of 1/2-BPS operators in the N=4 SYM. The correlator has been computed using unitarity methods and supersymmetric localisation to the first two orders in the expansion of the coupling constant of the N=4. I will discuss the spectrum of double-trace operators, the computation of their anomalous dimensions, and an approach that can be used to construct more general families of correlators.