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-rw-r--r--Doc/c-api/typeobj.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/Doc/c-api/typeobj.rst b/Doc/c-api/typeobj.rst
index a320d9e676..abcd1154f5 100644
--- a/Doc/c-api/typeobj.rst
+++ b/Doc/c-api/typeobj.rst
@@ -64,6 +64,10 @@ type objects) *must* have the :attr:`ob_size` field.
This field is not inherited by subtypes.
+ .. versionchanged:: 2.5
+ This field used to be an :ctype:`int` type. This might require changes
+ in your code for properly supporting 64-bit systems.
+
.. cmember:: PyTypeObject* PyObject.ob_type