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pg_description

The pg_description system catalog table stores optional descriptions (comments) for each database object. Descriptions can be manipulated with the COMMENT command and viewed with psql's \d meta-commands. Descriptions of many built-in system objects are provided in the initial contents of pg_description. See also pg_shdescription, which performs a similar function for descriptions involving objects that are shared across a Greenplum system.

Table 1. pg_catalog.pg_description
column	type	references	description
`objoid`	oid	any OID column	The OID of the object this description pertains to.
`classoid`	oid	pg_class.oid	The OID of the system catalog this object appears in
`objsubid`	int4		For a comment on a table column, this is the column number. For all other object types, this column is zero.
`description`	text		Arbitrary text that serves as the description of this object.