This is covered on our long-standing page about core updates: developers.google.com/search… "We're constantly making updates to our search algorithms, including smaller core updates. We don't announce all of these because they're generally not widely noticeable. Still, when released, they can cause content to recover if improvements warrant." We have a lot of different core and other ranking systems. They're regularly being updated. They're also processing new information, because the web itself is constantly changing. If we were giving notice about all the ranking system updates we do, it would be like this: Hi. It's 1:14pm -- we just did an update to system 112! Hi. It's 2:26pm -- we just did an update to system 34! Hi. It's 5:02pm -- we just did an update to system 76! That's because we do around 5,000 updates per year, as this covers: google.com/search/howsearchw… Plus, we'd also be saying: Hi. It's 12:45pm, results have changed slightly because the web just changed! Hi. it's 12:46pm, results have changed slightly because the web just changed! Hi. it's 12:47pm, results have changed slightly because the web just changed! Because already launched and existing systems *aren't themselves being updated* in how they operate, but *the information they're processing isn't static but instead is constantly changing*. This type of constant "hey, we did an update" notification stuff probably isn't really that useful to creators. There's nothing to "do" with those types of updates. That's why we focus on the ones where there's either something to consider or we just think they might be broadly noticeable. This past blog post explains more about that: blog.google/products/search/…