Can I post links in my answers to comments?

I wrote a story inspired by a drawing by Ann Madison. I made an author's note about the drawing, and now a couple of commenters want to know where they can find it. I wrote a reply to one of the commenters relating a link to the picture. Having just sent it I wondered if you allow such a thing in the library.
If I can, then what is the proper procedure. If I can't then let me know, and it will not happen again.
Did I goof?

Hi ernalones

Because the LSF is a non commercial site, we wouldn't want links spamming commercial products etc, but it's fine for you to incorporate the link in your author comment to the site where the drawing can be found. You can also inform individuals via a popup message.