Api parameter description not showing in swagger ui

I'm using Swagger UI to document an api, but having some trouble getting parameter descriptions to show up.  This is what my api docs look like:

All parameters have "description" set, but the description doesn't show up.  I have done some searching on this topic but haven't found any way to display descriptions via config, nor have I found any way to customize api docs views.  If anyone can point me in the right description it would be greatly appreciated.