The paper talks a lot about large sets of images. Most large sets of images currently is found on the internet (and that set is growing). However, the vast majority of image data today is accompanied by human labeling. I think that as a follow up to this paper, text labels should be incorporated into the process of learning classes of objects. Clearly if images on the web were perfectly labeled, there would be no need for this kind of research. However, the fact that text exists with images in almost every case (thanks to the web), cannot be ignored.