make category descriptions visible

The Brink Hi, I added category descriptions a few days ago while I was begining to work with this theme and I could have sworn that they appeared below the page title on the archive page for each category. However, the descriptions are no longer visible there. I was wondering if I have accidentally toggled some simple option or if I am wrong and the descriptions were never shown on this theme. I did try to use the solution provided in this thread, but my child theme doesn't yet have an "archive.php" file and I don't even know what I should write in it so that it behaves correctly. Or should I just copy the parent theme's "archive.php" file wholesale? That seems messy to me. Hope you can help, Thanks Rosie