This picture explains why it took so long for Apple to remember women menstruate

This year, there were two female presenters and executives on stage at Apple's World Wide Developers Conference - double the previous record.

The lack of women in the tech industry is a running theme of conferences, as journalist Alice Truong notes in this tweet.

With that in mind, it's no surprise that when Apple rolled out its native HealthKit app in September 2014 - billed as a comprehensive tracking system for fitness, weight and sleep - they appeared to forget that almost half the people in the world menstruate at some point in their lives. Monitoring selenium levels and caffeine intake? You betcha. Ovulation? Eww.

The oversight did not go unnoticed but was rectified on Monday when Apple's senior vice president of Software Engineering Craig Federighi announced several new metrics for the app - including an option for women to keep track of their periods.

Sadly there's no further information yet on how the new feature will work since the only screengrab Apple shared shows the other three new additions to the app.

More: For homeless women, a period can be a nightmare. This campaign aims to change that