More than 40 years of data on authors of ACM conference papers describe women’s contribution to this important aspect of computing professional life. The data show that women’s authorship increased substantially over time, and that relative to their representation in the likely pool of ACM conference paper authors, women Ph.D.s were especially productive. Initial tests indicate that the increase in women’s share of papers was due in large part to the increase in number of women in the community of potential authors.