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-rw-r--r--Doc/library/types.rst3
-rw-r--r--Misc/NEWS.d/next/Documentation/2019-05-31-10-46-36.bpo-36896.wkXTW9.rst2
2 files changed, 5 insertions, 0 deletions
diff --git a/Doc/library/types.rst b/Doc/library/types.rst
index e629c29..a21fb44 100644
--- a/Doc/library/types.rst
+++ b/Doc/library/types.rst
@@ -98,6 +98,9 @@ the types that arise only incidentally during processing such as the
Typical use of these names is for :func:`isinstance` or
:func:`issubclass` checks.
+
+If you instantiate any of these types, note that signatures may vary between Python versions.
+
Standard names are defined for the following types:
.. data:: FunctionType
diff --git a/Misc/NEWS.d/next/Documentation/2019-05-31-10-46-36.bpo-36896.wkXTW9.rst b/Misc/NEWS.d/next/Documentation/2019-05-31-10-46-36.bpo-36896.wkXTW9.rst
new file mode 100644
index 0000000..d75fcca
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2019-05-31-10-46-36.bpo-36896.wkXTW9.rst
@@ -0,0 +1,2 @@
+Clarify that some types have unstable constructor signature between Python
+versions.