Building a kernel with a patch

[Biggus Gazus]

Hi list,

Hopefully this is the place to ask, I've tried to follow this, so far 
so good ...

https://fedoraproject.org/wiki/Building_a_custom_kernel

I added these lines to my spec file, following the guide ...

Patch74912: scarlett.patch

ApplyPatch scarlett.patch

At the end of their respective sections. I try to build the RPM, and I 
get ...

ERROR: Patch scarlett.patch not listed as a source patch in specfile

Somebody in the chat room suggested I might need a SOURCE line or 
something as well? But the guide doesn't say that.

Any clues?

Cheers!

Gaz