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-rw-r--r--Doc/library/types.rst3
1 files changed, 3 insertions, 0 deletions
diff --git a/Doc/library/types.rst b/Doc/library/types.rst
index e629c2935f..a21fb44dda 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