I just used the "Questions about bugs in pre-release/beta software or prototype hardware are off-topic" close reason to vote to close a question.  I was looking for somewhere in the Help Center where it explains that questions about pre-release software are off-topic to point the user to, however I could not find any such language in the [What topics can I ask about here?][1] or [What types of questions should I avoid asking?][2] topics.  

Is this close reason explained somewhere else?  If not, should it not be added to the Help Center?


  [1]: http://superuser.com/help/on-topic
  [2]: http://superuser.com/help/dont-ask