In the Editorial titled “Prevalence and Severity of Alzheimer Disease in Individuals With Down Syndrome,”1 published online November 19, 2018, a typographical error was corrected in the sentence in the third paragraph that includes the phrase “late-onset epilepsy increased mortality risk in individuals with DS and dementia by 10-fold.” The phrase “in individuals with DS and dementia” was changed to “in individuals with DS without dementia.”