When I write user macros for our Confluence server, they appear in the macro browser by title only, with no description:

The description text only appears when the macro is selected:

I'm fairly sure the macro parameters are valid, like this:
## @param BackToTop:title=BackToTop|desc=Shows a 'Back to top' button when the user scrolls down the page
What am I missing to make the description appear in the macro browser window?
Also, the description has the inverted commas stripped out, for some reason