In the article, “Neuromuscular NMDA Receptors Modulate Developmental Synapse Elimination” by Kirkwood E. Personius, Barbara S. Slusher, and Susan B. Udin, which appeared on pages 8783–8789 of the August 24, 2016 issue, the authors apologize for four typos that appeared in our manuscript. On page 8785, column 2, paragraph 2, lines 3 and 5, we listed concentrations as “200 m” when they should have been “200 μm”. The same error occurs on page 8788, in lines 1 and 2 of the Figure 4 legend. This error does not affect any of the results, conclusions, or interpretations. This error has been corrected in the on-line PDF version.