I was working with a customer and he nor I could find in the sharding-related documentation how to create the initial user in a sharded cluster with --keyfile. We did end up guessing it was like an initial non-sharded database. I see now it is mentioned in: http://docs.mongodb.org/manual/administration/security/#authentication

Can we add the same information on creating the first user to the sharding security section in this document or link to it?
http://docs.mongodb.org/manual/core/sharding/