function addDispatchAsyncMethod() {
        $methodGenerator = new MethodGenerator('dispatchAsync');
        $body = 'return $this->api->executeAsync($request, $this, $callable);';

        $docBlock = $this->generateExecuteDocBlock('Dispatch the request for this operation and process the response asynchronously. Allows you to modify the request before it is sent.');

        $requestParameter = new ParameterGenerator('request', 'Amp\Artax\Request');
        $methodGenerator->setParameter($requestParameter);
        $tag = createParamTag($requestParameter, 'The request to be processed');
        $docBlock->setTag($tag);

        $callableParameter = new ParameterGenerator('callable', 'callable');
        $methodGenerator->setParameter($callableParameter);
        $callableTag = createParamTag($callableParameter, 'The callable that processes the response');
        $docBlock->setTag($callableTag);

        $methodGenerator->setDocBlock($docBlock);
        $methodGenerator->setBody($body);

        $this->classGenerator->addMethodFromGenerator($methodGenerator);
    }