Add explanation for super(type1, type2).
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index 7f5fa3a..fbb3f87 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1175,7 +1175,7 @@
If the second argument is omitted the super
object returned is unbound. If the second argument is an object,
``isinstance(obj, type)`` must be true. If the second argument is a type,
- ``issubclass(type2, type)`` must be true.
+ ``issubclass(type2, type)`` must be true (this is useful for classmethods).
.. note::
:func:`super` only works for :term:`new-style class`\es.