COMMENT ON CONSTRAINT

Hi,

I have a problem with the COMMENT command. Here:

http://www.postgresql.org/docs/7.4/static/sql-comment.html

it is defined in this way:

COMMENT ON
{
TABLE object_name |
COLUMN table_name.column_name |
AGGREGATE agg_name (agg_type) |
CONSTRAINT constraint_name ON table_name |
DATABASE object_name |
DOMAIN object_name |
FUNCTION func_name (arg1_type, arg2_type, ...) |
INDEX object_name |
OPERATOR op (leftoperand_type, rightoperand_type) |
RULE rule_name ON table_name |
SCHEMA object_name |
SEQUENCE object_name |
TRIGGER trigger_name ON table_name |
TYPE object_name |
VIEW object_name
} IS 'text'

I would like to comment a constraint but it doesn't work. I did the
following:

create table tab3 (
a integer,
b integer,
constraint uni unique (a, b)
);

comment on constraint uni on table tab3 is 'unique pair';

Did I do anything wrong or is this a bug?

cu Sascha

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