TO THE READERSHIP: An error appeared in the article by Mahaney et al. (Mahaney KB, Todd MM, Torner JC: Variation of patient characteristics, management, and outcome with timing of surgery for aneurysmal subarachnoid hemorrhage. J Neurosurg 114:1045-1053, 2011). Although the IHAST Investigators were mentioned in the author byline, the members of this group who contributed to the study were not named. An Appendix has been added to the article to list these collaborators. The article has been corrected online as of February 7, 2020.