Google is now starting to send out notifications about sites switching to the mobile-first indexing process. It is funny, because just an hour ago I reported that Google would begin expanding this rollout of the mobile first indexing but I have yet to see anyone claim they got a notification.

After I wrote it, two people I know said they just got a notification within the hour.

Ari Finkelstein shared a screen shot on Twitter and Jennifer Slegg posted one on her blog. So the notifications have begun.

Here is a screen shot from Ari:

Here is the text of the notification:

Mobile-first indexing enabled for domain name:

To owner of for domain name,

This means that you may see more traffic in your logs from Googlebot Smartphone. You may also see that snippets in Google Search results are now generated from the mobile version of your content.

Background: Mobile-first indexing means that Googlebot will now use the mobile version of your site for indexing and ranking, to better help our (primarily mobile) users find what they’re looking for. Google’s crawling, indexing, and ranking systems have historically used the desktop version of your site’s content, which can cause issues for mobile searchers when the desktop version differs from the mobile version. Our analysis indicates that the mobile and desktop versions of your site are comparable.

Forum discussion at Twitter.