docs: function(id, callback) {
          var self = this;
  
          var requestOptions = {
              uri: '/volumes/' + id,
              endpoint: rackspace.Endpoints.CloudBlockStorage
          };
  
          self.authorizedRequest(requestOptions, function(err, res, body) {
              if (err || !body.volume) {
                  callback(err ? err : body);
                  return;
              }
  
              callback(err, new rackspace.Volume(self, body.volume));
          });
      }