 Today's question is from Dan. He's asking, is there any plan to eventually let webmasters tell Google they want to be included in the mobile first index or at least be considered for inclusion? Some non-responsive sites might believe their mobile site is more SEO friendly than their desktop site. Mobile first indexing is a process of indexing websites using a smartphone-like user agent. We started working on this a few years ago because we noticed most users are now using smartphones. Mobile first indexing is separate from mobile friendliness, even sites that don't have a mobile version at all can be indexed fine with a mobile Googlebot. Our goal is to use the mobile first indexing for all websites in our search results. We're taking our time to make sure that users will continue to be able to find what they're looking for and to help site owners to adapt should there be something they need to do. We found that for the most part, sites can be indexed fine with a mobile device. At the moment, we're algorithmically testing to see when sites are ready and switching them over once that's the case. To determine when a site is ready, we compare the mobile and the desktop versions to make sure that we're still able to find all of the content, including structured data and images. With the longer term goal of moving all sites over to mobile first indexing, we don't plan to provide an opt-in or opt-out for this kind of indexing. If you're curious about mobile first indexing, we have a bunch of documentation and blog posts that I'll link in the description below. See you in the next episode of Ask Google Webmasters. Until then.