When browsing on mobile, Google really wants to make sure you get good results. As a consequence, they have announced that starting April 21st mobile-friendliness will play a larger role in how your sites rank on mobile devices. They go as far as saying that the change will have “significant impact”.
You can check whether Google feels that your site is mobile-friendly enough through their online tool, or right in Webmaster Tools.
If your site isn’t mobile friendly yet, now is definitely the time to make sure to get that fixed.