PostgreSQL 9.5.3 Documentation
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# 49.19. `pg_description`

The catalog `pg_description` stores optional descriptions (comments) for each database object. Descriptions can be manipulated with the COMMENT command and viewed with psql's `\d` 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 database cluster.

Table 49-19. `pg_description` Columns

Name | 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 (the `objoid` and `classoid` refer to the table itself). For all other object types, this column is zero.
`description` | `text` |  | Arbitrary text that serves as the description of this object

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