Our recently published article in JAMA Neurology was the third in a series of studies that assessed the ability of the Recurrence Risk Estimator (RRE) to predict the 90-day risk for recurrence after an ischemic stroke.1 The first 2 were internal validation studies that demonstrated good discrimination (C statistics, 0.80-0.85).2,3 The last assessed the validity of RRE in an international multicenter setting and revealed a comparable discriminative value (C statistic, 0.76),1 confirming the results of prior studies.