I've had the idea to make an ongoing commentary of my works as to share and discuss different topics and inspirations. Especially things the average reader would probably not know about (one early example being the concept of mythopoeic thought). It wouldn't be necessary to understand the main story, just a fun extra.
The question is, where would you put such a thing? I don't want anything as blunt as shoving in new commentary chapters into the main body of work, but I do want it to be conveniently accessible to readers somehow.
I made a facebook page. Well, actually, I appropriated the page for the TTRPG that I had been working on based on the setting, on the premise that working on the story that had provided the setting was working on the game itself. But close enough.
However, there is a point of concern: spoilers. There may well be some things that readers should not see, or should not see until after they've finished the story. In my case, commentary on things like why Niria's eyes are violet instead of some more natural color would completely ruin much of what my story is working so hard to accomplish. Imagine that: just knowing how and why someone has a peculiar eye color can take something away from a reader that they'll never be able to get back (spoilers being what they are). For me, this isn't a problem because there's really no interaction between the two people who actually follow the page (functionally, it's more of a work/note space) and Scribble Hub or Royal Road. And anyway, an author must confide in *someone* sooner or later. But commentary should be provided with caution, lest the author reveal more than it is well to let slip.
As I said, I used Facebook. However, I suspect the intent was to post the commentary HERE. In that case, why not start a new series and call it "[Story Title]: The Commentaries?"