Apple presents Healthkit as a comprehensive tracking system for human health. But back when it launched, the company seemed to have forgotten about the humans who have periods. In June, Apple tried to right this oversight by announcing that Healthkit would also track "reproductive health."

Still, details for what exactly that meant were scant. Now, the iOS 9 update to one women's health app offers some, um, clues. The makers of the app, called Clue, said today that it will integrate its period-tracking and fertility features with iOS 9 and HealthKit, complete with push notifications. Finally.

As soon they update to iOS 9 starting September 16, Clue users will be able to push such metrics as basal body temperature, cervical mucus quality, menstruation, ovulation test results, sexual activity, spotting, and weight to Apple's Health app.

Clue CEO and cofounder Ida Tin said the update will allow users to see their period and fertility information mapped along with their other health and fitness data. "This amount of data can only be a good thing, as it will offer doctors instant access to a far more detailed and accurate medical history," Tin said.

Apple has good reason to make more features available to period-having people. Women’s health apps are the second-largest market in the health and fitness category worldwide by downloads, just behind running apps, according to data compiled by Clue. Seven of the top 25 health apps in the US App Store are fertility and period-tracking apps.

Apple's initial misstep on not including reproductive health data highlights the importance of including people with diverse views in the process of shaping new technology to serve the most diverse population possible. That means not just coming up with ideas for products, but working to make sure the most tech-savvy users—many of whom are women!—are being served by those products, too.