UsrMove feature breaking "yum upgrade" upgrades from older releases to F17?

[Peter Robinson]

On Thu, Jan 26, 2012 at 2:43 PM, Harald Hoyer <harald at redhat.com> wrote:
> Am 25.01.2012 23:48, schrieb Peter Robinson:
>> Hi All,
>>
>> So I saw a rpm update and a number of other builds today when dealing
>> with various packaging bits. Checking the update [1] and reading the
>> attached bug [2] I was a little shocked to find that "yum upgrade"
>> between releases would be explicitly broken due to this feature.
>
> Not really true. "yum upgrade" will be supported, but it needs a little help
> with a special initramfs and an additiona

So why isn't it documented as such?