Seeing foreign key lookups in explain output

Hi list,

an explain analyze wish :

create table t1(id serial primary key);
create table t2(id serial primary key,
                ref integer references t1(id) on delete cascade);
...insert many rows in both tables...
explain delete from t1 where id < 10000;
...
The explain output will tell me it's using the index on t1's id, but it tells
me nothing about the seqscan that happens on t2 (because I forgot to add an
index on t2.ref).

It isn't the first time I get bitten by this, and I bet I'm not the only one.
The explain tells me everything will work fast, but reallity is 100 times
slower. Is there a way I can extend explain output to show the rest of the
work done behind the scene ? Fixing that performance issue is easy once you
see it, but most people will just look at the explain output and erroneously
conclude "it's as good as it gets".

--
Vincent de Phily