# ALTER TABLE … MODIFY COMMENT {#alter-modify-comment}
Adds, modifies, or removes comment on existing table, regardless if it was set before or not. Comment change is reflected in both [system.tables](../../../operations/system-tables/tables.md) and `SHOW CREATE TABLE` query.
**Syntax**
``` sql
ALTER TABLE [db].name [ON CLUSTER cluster] MODIFY COMMENT 'Comment'