In the article "Clozapine, Olanzapine, Risperidone, and Haloperidol in the Treatment of Patients With Chronic Schizophrenia and Schizoaffective Disorder" (Volavka et al., 159:255–262), an error appeared in the Results section. The seventh sentence of the second paragraph should have read "Hematological problems led to discontinuation in three patients receiving clozapine and two receiving risperidone; seizures caused premature termination in two patients receiving clozapine."