codeigniter4 controller name style like UserGroup

I name my controller UserGroup according to codeigniter4 coding style as it says:

Class names and namespaces SHOULD be declared in UpperCamelCase, also called StudlyCaps, unless another form is functionally required.

But when I try my controller on browser as http://localhost/usergroup it gives 404 - File Not Found error.
http://localhost/userGroup works. http://localhost/UserGroup works too. But http://localhost/usergroup doesn't.

Should I change my controller name to Usergroup or url to http://localhost/UserGroup (or http://localhost/userGroup)?

you can add routes.
$routes->add('usergroup','userGroup::index')