Singletons as Synthetic classes in Scala?

I am reading Programming in Scala, and I don't understand the following sentence (pdf p.112):

Each singleton object is implemented as an instance of a synthetic class referenced from a static variable, so they have the same initialization semantics as Java statics.

Does this mean the if I have a singleton FooBar in scala, the compiler will create a class named FooBar$?

Also what does the author mean by "referenced from a static variable"? Is there a hidden static variable somewhere holding a reference to some FooBar$ class?

I appreciate any help here.