This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
You can mention it as an assumption to address the scalability of application. But your application has to reflect to support scalability of the application showing it in Class diagram, Deployment diagram as well as.