If subscription to foreign table valid ?

Hi,

I observed that -we cannot publish "foreign table" in Publication

postgres=# create foreign table t (n int) server db1_server options
(table_name 't1');
CREATE FOREIGN TABLE

postgres=# create publication pub for table t;
ERROR: "t" is not a table
DETAIL: Only tables can be added to publications.
postgres=#

but same thing is not true for Subscription

postgres=# create foreign table t (n int) server db1_server options
(table_name 't');
CREATE FOREIGN TABLE
postgres=# alter subscription sub refresh publication ;
NOTICE: added subscription for table public.t
ALTER SUBSCRIPTION

Is this an expected behavior ? if we cannot publish then how can we
add subscription for it.

--
regards,tushar
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