public function comment(RunnerServiceContext $context, $comment)
    {
        // prepare transmission Id for result server.
        $testSession = $context->getTestSession();
        $item = $testSession->getCurrentAssessmentItemRef()->getIdentifier();
        $occurrence = $testSession->getCurrentAssessmentItemRefOccurence();
        $sessionId = $testSession->getSessionId();
        $transmissionId = "${sessionId}.${item}.${occurrence}";

        /** @var DeliveryServerService $deliveryServerService */
        $deliveryServerService = $this->getServiceManager()->get(DeliveryServerService::SERVICE_ID);
        $resultStore = $deliveryServerService->getResultStoreWrapper($sessionId);

        $transmitter = new \taoQtiCommon_helpers_ResultTransmitter($resultStore);

        // build variable and send it.
        $itemUri = TestRunnerUtils::getCurrentItemUri($testSession);
        $testUri = $testSession->getTest()->getUri();
        $variable = new ResponseVariable('comment', Cardinality::SINGLE, BaseType::STRING, new QtismString($comment));
        $transmitter->transmitItemVariable($variable, $transmissionId, $itemUri, $testUri);

        return true;
    }