If it was my own post, I might put an addendum on the end saying that authors X, Y, and Z above are all authors of color, and that I'm saying so because of Z (service to my readers, or because I think it's worth pointing out POC authors, or whatev). I think referencing race in-text (as opposed to an addendum) would reinforce the squirrely aspects of the way race is typically mentioned and not-mentioned in articles where race isn't relevant. ("How irrelevantly exotic! An Asian author in YA SF!" plus a side heaping of white-as-unmarked-category.)

Not saying an addendum is a good solution, but it is a second topic, and thus supports being a second part to the post. That is, if you can tolerate cobbled-on bits -- your posts are more formal than mine tend to be.