> ## Documentation Index
> Fetch the complete documentation index at: https://www.pgschema.com/llms.txt
> Use this file to discover all available pages before exploring further.

# COMMENT ON

## Syntax

```sql theme={null}
comment_on ::= COMMENT ON object_type object_name IS 'comment_text'
             | COMMENT ON object_type object_name IS NULL

object_type ::= COLUMN | FUNCTION | INDEX | MATERIALIZED VIEW | PROCEDURE | TABLE | VIEW

object_name ::= [schema.]name
              | [schema.]table_name.column_name                -- for columns
              | [schema.]function_name(argument_types)         -- for functions
              | [schema.]procedure_name(argument_types)        -- for procedures
```

`COMMENT ON` is supported for the following objects:

* Column
* Function
* Index
* Materialized View
* Procedure
* Table
* View