Update SupportForRDSMultiAzDBCluster.md

Author: fangli

docs/using-the-jdbc-driver/SupportForRDSMultiAzDBCluster.md

@@ -32,6 +32,10 @@ Connection conn = DriverManager.getConnection("jdbc:aws-wrapper:postgresql://clu
 
 ## Optimizing Switchover Time
 
+Amazon RDS Multi-AZ with two readable standbys now supports minor version upgrades with 1 second of downtime.
+
+See feature announcement [here](https://aws.amazon.com/about-aws/whats-new/2023/11/amazon-rds-multi-az-two-stanbys-upgrades-downtime/).
+
 During minor version upgrades of RDS Multi-AZ DB clusters, the `failover` plugin switches the connection from the current writer to a newly upgraded reader. If minimizing downtime during switchover is critical to your application, consider adjusting the `failoverClusterTopologyRefreshRateMs` to a lower value such as 100ms, from the default 2000ms. However, be aware that this can potentially increase the workload on the database during the switchover.
 
 For more details on the `failover` plugin configuration, refer to the [Failover Configuration Guide](/docs/using-the-jdbc-driver/FailoverConfigurationGuide.md).