Interface private & "default" added by javac

[Ionut]

Hello All,
   I have an initial interface containing one default and one private method:
public interface InterfacePrivateMethod {
    default void foo(){
        print();
    }
    private void print() {
        System.out.println("Private Method");
    }
}
After I compile it with javac and then decompile, the class I get looks like:
public interface InterfacePrivateMethod {
    default void foo() {
        this.print();
    }
    private default void print() { // private default !?
        System.out.println("Private Method");
    }
}

Basically javac inserts default in the private method signature. 
Could you please provide more details about this, why is that? At the Java source code level a private method cannot be default in the same time inside an Interface.
Thanks a lot,Ionut

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