To be clear, this is not the same as the small text blurbs that already appear under search results. Those will still exist, but you'll now be able to tap the three-dot menu at the top right of a given result to see an expanded site description, instead of just...
https://www.techspot.com/news/88483-google-begin-showing-you-optional-website-descriptions-search.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/88483-google-begin-showing-you-optional-website-descriptions-search.html?utm_source=dlvr.it&utm_medium=blogger