How to add multiple PGP keys to my keybase ID?

Question

I am using keybase and I try to add to add a secondary PGP key to my ID. However, when I try to select a key from my local keyring, I get the following message.

 ~ $ keybase pgp select
▶ ERROR You already have a PGP key registered (0CF0 0000 0000 0000 0000 0000 0000 0000 0000 3200)
Specify the `--multi` flag to override this check

From this blog post I understand it is totally possible to add multiple keys and accounts to your keybase ID. But how? The error message above tells me something about a --multi flag, but it seems my keybase version does not recognize it:

 ~ $ keybase pgp --multi select
Incorrect Usage.
[...]
Error parsing command line arguments: flag provided but not defined: -multi

Or:

 ~ $ keybase --multi pgp select
Incorrect Usage.
[...]
Error parsing command line arguments: flag provided but not defined: -multi

How to add multiple PGP keys to my keybase ID?

Edit: Keybase version 1.0.17 on ArchLinux.

Answer 1

It's keybase pgp select --multi – that is, an option to the select subcommand.