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 51.47. pg_shdescription Columns
| Column Type Description | 
|---|
| 
        The OID of the object this description pertains to | 
| 
        The OID of the system catalog this object appears in | 
| 
        Arbitrary text that serves as the description of this object |