We need to add the Mongo.getWriteConcern and Mongo.setWriteConcern methods to the documentation. It is important to note that Mongo.setWriteConcern will cause a termination of the connection and re-establishmend (like Mongo.setReadConcern ). Since Mongo.setReadConcern is not fully documented, I don't know if you want to add full Mongo.setWriteConcern documentation, yet. I can provide the detailed signature if you need it.