How do I call a super class method

I have two classes A, and B. Class B overrides the foo method of class A. Class B has a bar method where I want to call the foo method of the super class. What is the syntax for such a call? class A def foo "hello" end end class B < A def foo super + " world" end def bar # how to call the `foo` method of the super class? # something similar to super.foo end end For class methods I can call the met