In the article “Identified Serotonergic Modulatory Neurons Have Heterogeneous Synaptic Connectivity within the Olfactory System of Drosophila,” by Kaylynn E. Coates, Adam T. Majot, Xiaonan Zhang, Cole T. Michael, Stacy L. Spitzer, Quentin Gaudry, and Andrew M. Dacks, which appeared on pages 7318–7331 of the August 2, 2017 issue, the fly stock was listed incorrectly. On page 7319, in lines 9 and 10 of the Materials and Methods, the Bloomington Drosophila Stock Center (BDSC) number listed for the QUAS-ChR2 flies is #58402 and it should have been #52260. This error does not affect the conclusions of the article. The online version has been corrected.