Wednesday, March 16, 2016
If you've already made your site mobile-friendly, you will not be impacted by this update. If you need support with your mobile-friendly site, we recommend checking out the Mobile-Friendly Test and the Webmaster Mobile Guide, both of which provide guidance on how to improve your mobile site. And remember, the intent of the search query is still a very strong signal — so even if a page with high quality content is not mobile-friendly, it could still rank well if it has great, relevant content.
If you have any questions, please go to the Webmaster help forum.