we can call singleton types now
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index 4bae255..2840055 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -2706,7 +2706,7 @@
This object is returned by functions that don't explicitly return a value. It
supports no special operations. There is exactly one null object, named
-``None`` (a built-in name).
+``None`` (a built-in name). Calling ``type(None)`` produces the same singleton.
It is written as ``None``.
@@ -2718,7 +2718,8 @@
This object is commonly used by slicing (see :ref:`slicings`). It supports no
special operations. There is exactly one ellipsis object, named
-:const:`Ellipsis` (a built-in name).
+:const:`Ellipsis` (a built-in name). Calling ``type(Ellipsis)`` produces the
+:const:`Ellipsis` singleton.
It is written as ``Ellipsis`` or ``...``.
@@ -2728,7 +2729,8 @@
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.
+information. There is exactly one ``NotImplemented`` object. Calling
+``type(NotImplemented)`` produces the singleton instance.
It is written as ``NotImplemented``.