pg_shdescription   The catalog pg_shdescription stores optional
   descriptions (comments) for shared database objects.  Descriptions can be
   manipulated with the COMMENT command and viewed with
   psql's \d commands.
  
   See also pg_description,
   which performs a similar function for descriptions involving objects
   within a single database.
  
   Unlike most system catalogs, pg_shdescription
   is shared across all databases of a cluster: there is only one
   copy of pg_shdescription per cluster, not
   one per database.
  
Table 51.48. pg_shdescription Columns
| Name | Type | References | Description | 
|---|---|---|---|
| objoid | oid | any OID column | The OID of the object this description pertains to | 
| classoid | oid |  | The OID of the system catalog this object appears in | 
| description | text | Arbitrary text that serves as the description of this object |