Mention Ellipsis pickling in the docs (pythonGH-103660)

sterliakov · miss-islington · commit a9366f98ce80 · 2023-08-30T01:11:43.000Z
(cherry picked from commit 14ec0bb) Co-authored-by: sterliakov <50529348+sterliakov@users.noreply.github.com>
diff --git a/Doc/library/pickle.rst b/Doc/library/pickle.rst
@@ -494,7 +494,8 @@ What can be pickled and unpickled?
 
 The following types can be pickled:
 
-* ``None``, ``True``, and ``False``;
+* built-in constants (``None``, ``True``, ``False``, ``Ellipsis``, and
+  ``NotImplemented``);
 
 * integers, floating-point numbers, complex numbers;
 
