The checksum files sent by an upload really assume that the recipient knows something about checksums. It’s also very difficult to discover what these files are used for lacking the ability to google (whether one arrives at “RFC-1321” or not)

In order to alleviate that assumption, I added some documentation to the actual .sum checksum files provided during an upload. This still requires that a recipient opens the file, but it’s a useful step forward until I can reach through a screen and click the user’s mouse for him.