Обсуждение: pg_subscription - substream column?

I noticed that the PG docs [1] for the catalog pg_subscription doesn't
have any mention of the substream column.

Accidental omission by commit 4648243 [2] from last year?

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[1] https://www.postgresql.org/docs/devel/catalog-pg-subscription.html
[2] https://github.com/postgres/postgres/commit/464824323e57dc4b397e8b05854d779908b55304

Kind Regards,
Peter Smith.
Fujitsu Australia