bpo-38650: Constify PyStructSequence_UnnamedField. (GH-17005)
Make it a constant and referring to a constant string.
diff --git a/Doc/c-api/tuple.rst b/Doc/c-api/tuple.rst
index 25df397..62bc9a5 100644
--- a/Doc/c-api/tuple.rst
+++ b/Doc/c-api/tuple.rst
@@ -182,10 +182,13 @@
+-----------+------------------+-----------------------------------------+
-.. c:var:: char* PyStructSequence_UnnamedField
+.. c:var:: const char * const PyStructSequence_UnnamedField
Special value for a field name to leave it unnamed.
+ .. versionchanged:: 3.9
+ The type was changed from ``char *``.
+
.. c:function:: PyObject* PyStructSequence_New(PyTypeObject *type)