dimmed section in web.config

I created a new asp.net MVC 4 internet application.  I pulled the latest nugget package for elmah.  When I look at the web.config file, there's a section <location path="elmah.axd" inheritInChildApplications="false">.....etc, etc.

I did some research, and I think I understand the basic concept of what that section is doing, but what I'm wondering is why it's dimmed out in Visual Studio 2012.