Correction to Supporting Information for “Dominance rank-associated gene expression is widespread, sex-specific, and a precursor to high social status in wild male baboons,” by Amanda J. Lea, Mercy Y. Akinyi, Ruth Nyakundi, Peter Mareri, Fred Nyundo, Thomas Kariuki, Susan C. Alberts, Elizabeth A. Archie, and Jenny Tung, which was first published December 11, 2018; 10.1073/pnas.1811967115 (Proc. Natl. Acad. Sci. U.S.A. 115, E12163–E12171). The authors note that, in the SI Appendix, the concentration of the lipopolysaccharide stimulant on page 3, first full paragraph, line 4 was reported incorrectly. Subsequently, “1 ug/mL lipopolysaccharide” should instead appear as “0.1 ug/mL lipopolysaccharide.” The SI Appendix has been corrected online.