diff --git a/Doc/library/unittest.mock.rst b/Doc/library/unittest.mock.rst
index 3cc22fdde71..c6d0ec92b6e 100644
--- a/Doc/library/unittest.mock.rst
+++ b/Doc/library/unittest.mock.rst
@@ -1831,6 +1831,9 @@ sentinel
     the same attribute will always return the same object. The objects
     returned have a sensible repr so that test failure messages are readable.
 
+    The ``sentinel`` attributes don't preserve their identity when they are
+    :mod:`copied <copy>` or :mod:`pickled <pickle>`.
+
 Sometimes when testing you need to test that a specific object is passed as an
 argument to another method, or returned. It can be common to create named
 sentinel objects to test this. :data:`sentinel` provides a convenient way of