How to add a new DC to cluster in Cassandra 2.x

[Lu, Boying]

Hi, All,

I'm new to Cassandra. I want to know how to add a DC to existing Cassandra 
cluster (all running Cassandra 2.x).
I found a related document at 
http://www.datastax.com/docs/1.1/cluster_management

Is it still valid for Cassandra 2.x?

Thanks

Boying