I think it's okay. Just a small quip thrown in from the side that's still relevant to the topic of discussion. It would not be okay (IMO) if you tried to derail

I think it's okay. Just a small quip thrown in from the side that's still relevant to the topic of discussion. It would not be okay (IMO) if you tried to derail the discussion to focus on your link instead; in this case, a regular submission should be made.