pg_rules view

I tried creating a rule like:

create rule "_RETURN" as on select to asfd do instead select * from blah;

And it worked.

But it doesn't appear in pg_rules.

I created this one:

create rule myrule as on insert to asfd do instead nothing;

And it does appear:

test=# select * from pg_rules ;
schemaname | tablename | rulename |
definition
------------+-------------+---------------+-----------------------------------------------------------------------------------------------------------------------------------------------------
pg_catalog | pg_settings | pg_settings_n | CREATE RULE pg_settings_n AS
ON UPDATE TO pg_settings DO INSTEAD NOTHING;
pg_catalog | pg_settings | pg_settings_u | CREATE RULE pg_settings_u AS
ON UPDATE TO pg_settings WHERE (new.name = old.name) DO SELECT
set_config(old.name, new.setting, false) AS set_config;
chriskl | asfd | myrule | CREATE RULE myrule AS ON
INSERT TO asfd DO INSTEAD NOTHING;
(3 rows)

What gives?

Chris