From 3cbade7d309ab1ea97ec286d19d506df30bd1ab7 Mon Sep 17 00:00:00 2001
From: Joannah Nanjekye <33177550+nanjekyejoannah@users.noreply.github.com>
Date: Thu, 9 Jul 2020 21:36:35 -0300
Subject: bpo-23802: patch: __deepcopy__ memo dict argument usage (GH-21326)

* Clarify __deepcopy__ memo dict argument usage

* Add full stop
---
 Doc/library/copy.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Doc/library/copy.rst b/Doc/library/copy.rst
index a8e8bfb..176e01d 100644
--- a/Doc/library/copy.rst
+++ b/Doc/library/copy.rst
@@ -86,6 +86,7 @@ The latter is called to implement the deep copy operation; it is passed one
 argument, the ``memo`` dictionary.  If the :meth:`__deepcopy__` implementation needs
 to make a deep copy of a component, it should call the :func:`deepcopy` function
 with the component as first argument and the memo dictionary as second argument.
+The memo dictionary should be treated as an opaque object.
 
 
 .. seealso::
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