In the article “Two Brains in Action: Joint-Action Coding in the Primate Frontal Cortex,” by Simone Ferrari-Toniolo, Federica Visco-Comandini, and Alexandra Battaglia-Mayer, which appeared on pages 3514–3528 of the May 1, 2019 issue, the authors inadvertently neglected to acknowledge the important contribution of Odysseas Papazachariadis for his considerable help during data collection. The corrected Acknowledgments should read: “This work was supported by the MIUR of Italy (Grant N. 2010XPMFW4_004) and by SAPIENZA-University of Rome (C26A15NXPT) to A.B.-M. The authors thank Paul B. Johnson for his valuable contribution to laboratory setup, Odysseas Papazachariadis for his considerable help during data collection, and Roberto Caminiti for his useful comments and suggestions during the preparation of the paper.” The online version has been updated.