We concur that prospective mood charting is the most valid way to establish the occurrence of premenstrual mood symptoms and that, in the absence of this approach, some women with affective disorders will misattribute changes in their mood that are unrelated to the menstrual cycle as premenstrual mood exacerbation. Studies of the validity of retrospective reporting have not been conducted in women with bipolar disorder who endorse premenstrual exacerbation of their underlying mood disorder. However, it is likely that some women with bipolar disorder who retrospectively endorse premenstrual mood exacerbation may not show premenstrual mood exacerbation when their moods are monitored prospectively. This is consistent with what has been observed in women with unipolar depression. Treatments targeting premenstrual mood exacerbation in women with affective illness should utilize prospective mood rating before initiating interventions directed at premenstrual mood exacerbation, especially when the intervention is circumscribed within the luteal phase of the menstrual cycle (e.g., intermittent dosing of a selective serotonin reuptake inhibitor) or involves a hormonal contraceptive therapy.