In the October article "The Prognostic Significance of ‘Switching’ in Patients With Bipolar Disorder: A 10-Year Prospective Follow-Up Study" (Maj et al., 159: 1711–1717), there was an editorial error in the Method section. In the second paragraph of the Procedures section, the first sentence refers to the Montgomery-Åsberg Depression Rating Scale. It should have been changed to the Comprehensive Psychopathological Rating Scale to reflect the author's original wording and subsequent revision.