Some more examples:

<programlisting>

COMMENT ON ACCESS METHODrtree IS 'R-Tree access method';

COMMENT ON ACCESS METHODgin IS 'GIN index access method';

COMMENT ON AGGREGATE my_aggregate (double precision) IS 'Computes sample variance';

COMMENT ON CAST (text AS int4) IS 'Allow casts from text to int4';

COMMENT ON COLLATION "fr_CA" IS 'Canadian French';

COMMENT ON CONSTRAINT dom_col_constr ON DOMAIN dom IS 'Constrains col of domain';

COMMENT ON DATABASE my_database IS 'Development Database';

COMMENT ON DOMAIN my_domain IS 'Email Address Domain';

COMMENT ON EVENT TRIGGER abort_ddl IS 'Aborts all DDL commands';

COMMENT ON EXTENSION hstore IS 'implements the hstore data type';

COMMENT ON FOREIGN DATA WRAPPER mywrapper IS 'my foreign data wrapper';

COMMENT ON FOREIGN TABLE my_foreign_table IS 'Employee Information in other database';

COMMENT ON OPERATOR FAMILY integer_ops USING btree IS 'all integer operators for btrees';

COMMENT ON POLICY my_policy ON mytable IS 'Filter rows by users';

COMMENT ON PROCEDURE my_proc (integer, integer) IS 'Runs a report';

COMMENT ON PUBLICATION alltables IS 'Publishes all operations on all tables';

COMMENT ON ROLE my_role IS 'Administration group for finance tables';

COMMENT ON ROUTINE my_routine (integer, integer) IS 'Runs a routine (which is a function or procedure)';

COMMENT ON RULE my_rule ON my_table IS 'Logs updates of employee records';

COMMENT ON SCHEMA my_schema IS 'Departmental data';

COMMENT ON SEQUENCE my_sequence IS 'Used to generate primary keys';

COMMENT ON SERVER myserver IS 'my foreign server';

COMMENT ON STATISTICS my_statistics IS 'Improves planner row estimations';

COMMENT ON SUBSCRIPTION alltables IS 'Subscription for all operations on all tables';

COMMENT ON TABLE my_schema.my_table IS 'Employee Information';

COMMENT ON TABLESPACE my_tablespace IS 'Tablespace for indexes';

COMMENT ON TEXT SEARCH CONFIGURATION my_config IS 'Special word filtering';