# BarrettCIB3-6 **Keywords:** evolution, cooperation, cheater detection, free-riding, mindreading Submitted: 06/05/10 Accepted: 06/06/10 Previously published online: www.landesbioscience.com/journals/cib/ article/12604 *Correspondence to: Clark Barrett, Email: [email protected] Addendum to: Cosmides L, Barrett HC, Tooby J. Adaptive specializations, social exchange, and the evolution of human intelligence. Proc Natl Acad Sci USA 2010, 107:9007–14, PMID: 20445099, DOI: 10.1073/pnas.0914623107. **Opening (not a real abstract):** This manuscript has been published online, prior to printing. Once the issue is complete and page numbers have been assigned, the citation will change accordingly. **Authors:** [[Autophagic Punctum]]