document NotImplemented

diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index 944e763040989b16bc8039ccfa571c1614140b8f..9ffb48a2efad88c7ce417e51b9f7a477e7cac8b5 100644 (file)
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -2932,6 +2932,15 @@ supports no special operations.  There is exactly one ellipsis object, named
 
 It is written as ``Ellipsis``.
 
+The NotImplemented Object
+-------------------------
+
+This object is returned from comparisons and binary operations when they are
+asked to operate on types they don't support. See :ref:`comparisons` for more
+information.
+
+It is written as ``NotImplemented``.
+
 
 Boolean Values
 --------------