In the Observation titled “Narcolepsy, REM Sleep Behavior Disorder, and Supranuclear Gaze Palsy Associated with Ma1 and Ma2 Antibodies and Tonsillar Carcinoma,” by Adams et al, published in the April issue of the Archives (2011;68[4]:521-524), at the very end of the second sentence of the first paragraph in the left column of page 523, reference 5 (Hoffmann et al) should have been cited instead of reference 3 (Dalmau et al).