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 |
SEQUENCEobject_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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