diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -4261,6 +4261,15 @@ An example of dictionary view usage::
    >>> keys ^ {'sausage', 'juice'}
    {'juice', 'sausage', 'bacon', 'spam'}
 
+.. note::
+   To check whether a variable is a view object, Python provides an
+   :term:`abstract base class` for each type of view object, to allow instance
+   and subclass checking with :func:`isinstance` and :func:`issubclass`. The
+   :class:`collections.abc.KeysView`, :class:`collections.abc.ValuesViews`,
+   and :class:`collections.abc.ItemsView` ABCs may be used to check for
+   :meth:`dict.keys`, :meth:`dict.values` and :meth:`dict.items`, respectively.
+   To check for any type of view object, use
+   :class:`collections.abc.MappingView`.
 
 .. _typecontextmanager: