document NotImplemented

diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index e43fc041c3c2e33e53eb7d358d6744c58065f36e..edad9c7df6d9b7663ef1c712eb32e0305e5c9e45 100644 (file)
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -2711,6 +2711,15 @@ special operations.  There is exactly one ellipsis object, named
 
 It is written as ``Ellipsis`` or ``...``.
 
+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
 --------------