Wrong sentence - Mailing list pgsql-docs

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.6/static/indexam.html
Description:

https://www.postgresql.org/docs/current/static/indexam.html

=> "All indexes in PostgreSQL are what are known technically as secondary
indexes;" 

Shouldn't that be:
"All indexes in PostgreSQL are known technically as secondary indexes;" 

Cheers,
Daniel