# File lib/fog/aws/requests/emr/add_instance_groups.rb, line 23
        def add_instance_groups(job_flow_id, options={})
          
          if instance_groups = options.delete('InstanceGroups')
            options.merge!(Fog::AWS.indexed_param('InstanceGroups.member.%d', [*instance_groups]))
          end
    
          request({
            'Action'  => 'AddInstanceGroups',
            'JobFlowId' => job_flow_id,
            :parser   => Fog::Parsers::AWS::EMR::AddInstanceGroups.new,
          }.merge(options))
        end