-f yaml isn't supported by hugo

[Kaligule]

In the Readme I read

hugo new post/post-name.md -f yaml

But running this gives me

Error: unknown shorthand flag: 'f' in -f

And indeed I can't find it in the hugo help pages (like hugo new --help). Perhaps this was valid once and is now depricated?

[Kaligule]

I just noticed it is supported for hugo new site, but not for hugo new post.