It's a Fallout New Vegas thing.
If your only Fallout game is Fallout 4, you should absolutely pick up Fallout 3 and Fallout New Vegas. They're both available on Steam or backwards compatible on consoles. They can be annoying to get working properly though. In my experience, the advantage of PC is that you get mods, while the advantage of console is that it's a lot easier to get working and (in my experience!) a lot more stable.