Ada Lovelace Day (ALD) is an international celebration of the achievements of women in science, technology, engineering and maths (STEM). Lovelace was a 19th-century English mathematician and writer who also happened to be the very first computer programmer. She wrote what were essentially computer programs for the analytical engine that computing pioneer Charles Babbage was designing but never actually created. Her contributions were largely overlooked – an issue that continues to exist for women in many fields, especially science. To join the global celebration of Ada Lovelace and to advance the day’s goal of increasing the profile of women in STEM, York University Libraries will again host its annual Women in Science Wiki Edit-a-thon on November 3, 2022, from 12PM – 3PM EST. This year’s event will be hosted online and encourages anyone to drop-by to contribute, no experience necessary; training will be provided. This year’s Edit-a-thon will focus on creating and improving both Wikipedia articles and Wikidata items about women in STEM fields. To learn more about Ada Lovelace Day, visit https://researchguides.library.yorku.ca/ada.