code: func (c *MTurk) CreateAdditionalAssignmentsForHIT(input *CreateAdditionalAssignmentsForHITInput) (*CreateAdditionalAssignmentsForHITOutput, error) {
  	req, out := c.CreateAdditionalAssignmentsForHITRequest(input)
  	return out, req.Send()
  }
docs: // CreateAdditionalAssignmentsForHIT API operation for Amazon Mechanical Turk.
  //
  // The CreateAdditionalAssignmentsForHIT operation increases the maximum number
  // of assignments of an existing HIT.
  //
  // To extend the maximum number of assignments, specify the number of additional
  // assignments.
  //
  // HITs created with fewer than 10 assignments cannot be extended to have 10
  // or more assignments. Attempting to add assignments in a way that brings the
  // total number of assignments for a HIT from fewer than 10 assignments to 10
  // or more assignments will result in an AWS.MechanicalTurk.InvalidMaximumAssignmentsIncrease
  // exception.
  //
  // HITs that were created before July 22, 2015 cannot be extended. Attempting
  // to extend HITs that were created before July 22, 2015 will result in an AWS.MechanicalTurk.HITTooOldForExtension
  // exception.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for Amazon Mechanical Turk's
  // API operation CreateAdditionalAssignmentsForHIT for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeServiceFault "ServiceFault"
  //   Amazon Mechanical Turk is temporarily unable to process your request. Try
  //   your call again.
  //
  //   * ErrCodeRequestError "RequestError"
  //   Your request is invalid.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/mturk-requester-2017-01-17/CreateAdditionalAssignmentsForHIT