Pushing/fetching from/into a shallow-cloned repository

The git-clone manual page, both [1] and my local copy coming with Git for Windows 1.8.1, say about the --depth command-line option:

   --depth <depth>

     Create a shallow clone with a history truncated to the specified
     number of revisions. A shallow repository has a number of
     limitations (you cannot clone or fetch from it, nor push from nor
     into it), but is adequate if you are only interested in the recent
     history of a large project with a long history, and would want to
     send in fixes as patches.

But having done a shallow clone (--depth=1) of one of my repositories, I was able to record a new commit, push it out to a "reference" bare repository and then fetch back to another clone of the same repository just fine. I have then killed my test commit doing a forced push from another clone and subsequently was able to do `git fetch` in my shallow clone just fine.

So I observe pushing/fetching works OK at least for a simple case like this one.

Hence I'd like to ask: if the manual page is wrong or I'm observing some corner case?