The AUH will receive some changes for 1.9 and installation of it will require documentation changes as well. The README file already there should be updated and it is recommended to do a README.md with the possibility of taking this to a wiki page.
https://lists.yoctoproject.org/pipermail/yocto/2015-October/026799.html
At, http://git.yoctoproject.org/cgit/cgit.cgi/auto-upgrade-helper/commit/?id=34ae735ed811049f3f4a6a7a82a14de81f097f37