Java tutorial says I can have a package-private interface, but I can't

In the Java tutorial "Defining an Interface", it says

If you do not specify that the interface is public, your interface will be accessible only to classes defined in the same package as the interface.

However, this

interface PPInterface {
    void foo();
    void bar();
}

class NewClass implements PPInterface {
    void foo() {}
    void bar() {}
}

generates compiler errors in NewClass because I am 'attempting to assign weaker access privileges; was public'. So the documentation is wrong, or I did something wrong, or I misinterpreted the documentation?

I suppose I don't have to use an interface-- I like it because it keeps things nicely organized.