How did hackady do this?

I noticed that my youtube video has a "comment" below the click count that states that this video can also be seen at hackaday. This is not a standard comment but obviously something special. Has anyone here an idea how this kind of comment is created? I am asking because I want to have a similar comment for all of my videos but pointing back to my blog. I googled around but obviously I am searching for the wrong keywords. Is there anyone here who knows how to implement this?

I think it is explained here:-

Hmm, I see. So probably my website is not considered a "web feed". Has anyone an idea how I can publish a "web feed" with