Board Thread:General Discussion/@comment-24152851-20140919112128/@comment-1038387-20140919130103

If you can't demote yourself, kindly explain to the user that promoted you that you have no interest in being an admin, and politely request that (s)he remove the rights. There isn't a rule against stealth promotions, but it's more or less considered bad form to promote without asking.

Usually, you get an email notification when your user rights have been changed on any wiki.