UMG Documentation for 4.4 Preview

Do I have to change my Build files somehow to include UMG.h in C++?
Runtime/UMG/Public/ is apparently not in my include path and including “Runtime/UMG/Public/UMG.h” directly also doesn’t help, because it will just fail to include it’s dependencies…
I’ve tried adding a class inheriting from UWidget and refreshing/recreating the project files, but that didn’t help.

Edit: Okay, after adding UMG as a module dependency in my Build.cs I might be getting somewhere.