We noted that rs3817870 was a methylation quantitative trait locus (meQTL) for cg19534438 in G0S2 (p = 0.023) and rs1550637 was a meQTL for cg25526519 in RCCD1, but that these SNPs were not confounded with the PTSD associations observed at these two loci. Here, RCCD1 is linked to post-traumatic stress disorder.