use_remote_explain missing in docs of postgres_fdw

Hi all,

While testing a bit this feature, I noticed that use_remote_explain is
available in the list of options for FOREIGN TABLE and SERVER but this is
not specified in the docs:
http://www.postgresql.org/docs/devel/static/postgres-fdw.html

postgres=# CREATE FOREIGN TABLE foo (a int, b int) server postgres_server
options (table_name 'aa', foo 'true');
ERROR: invalid option "foo"
HINT: Valid options in this context are: schema_name, table_name,
use_remote_explain

Regards,
--
Michael