If you have a list of what's new, make sure to include a link to it right next to the file name.
To help you "develop a good text" for that file name, I’ve drafted a few options depending on where you plan to post it (like a dev log, a forum, or a Discord announcement). File: UNDER.the.SAND.Update.17.zip ...
Which of these styles works best for you, or should we to be more specific to your project? If you have a list of what's new,