Back in June, Google updated their site moving documentation drastically but webmasters questioned why Google specifically recommended using 302 redirects to communicate separate smartphone URLs from desktop URLs. Well that has changed.

Aleyda Solis spotted that Google changed the documentation recently to now say use 301 redirects. Aleyda posted this on Google+ with before and after pictures.

In short, before it said:

Now it says:

Also before it said in the from same URLs to separate URLs case:

Now it says:

Here is a screen shot from Aleyda:

Makes you wonder, with Matt Cutts using 302 redirects himself, if this is intentional or not.

Forum discussion at Google+.