name : modify-db-subnet-group.rst **To modify an Amazon DocumentDB subnet group** The following ``modify-db-subnet-group`` example modifies the subnet group ``sample-subnet-group`` by adding the specified subnets and a new description. :: aws docdb modify-db-subnet-group \ --db-subnet-group-name sample-subnet-group \ --subnet-ids subnet-b3806e8f subnet-53ab3636 subnet-991cb8d0 \ --db-subnet-group-description "New subnet description" Output:: { "DBSubnetGroup": { "DBSubnetGroupName": "sample-subnet-group", "SubnetGroupStatus": "Complete", "DBSubnetGroupArn": "arn:aws:rds:us-west-2:123456789012:subgrp:sample-subnet-group", "VpcId": "vpc-91280df6", "DBSubnetGroupDescription": "New subnet description", "Subnets": [ { "SubnetIdentifier": "subnet-b3806e8f", "SubnetStatus": "Active", "SubnetAvailabilityZone": { "Name": "us-west-2a" } }, { "SubnetIdentifier": "subnet-53ab3636", "SubnetStatus": "Active", "SubnetAvailabilityZone": { "Name": "us-west-2c" } }, { "SubnetIdentifier": "subnet-991cb8d0", "SubnetStatus": "Active", "SubnetAvailabilityZone": { "Name": "us-west-2b" } } ] } } For more information, see `Modifying an Amazon DocumentDB Subnet Group <https://docs.aws.amazon.com/documentdb/latest/developerguide/document-db-subnet-groups.html#document-db-subnet-group-modify>`__ in the *Amazon DocumentDB Developer Guide*.