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-rw-r--r--Doc/c-api/dict.rst7
1 files changed, 5 insertions, 2 deletions
diff --git a/Doc/c-api/dict.rst b/Doc/c-api/dict.rst
index 5a9dca2..aeff640 100644
--- a/Doc/c-api/dict.rst
+++ b/Doc/c-api/dict.rst
@@ -201,8 +201,11 @@ Dictionary Objects
.. c:function:: int PyDict_Update(PyObject *a, PyObject *b)
- This is the same as ``PyDict_Merge(a, b, 1)`` in C, or ``a.update(b)`` in
- Python. Return ``0`` on success or ``-1`` if an exception was raised.
+ This is the same as ``PyDict_Merge(a, b, 1)`` in C, and is similar to
+ ``a.update(b)`` in Python except that :c:func:`PyDict_Update` doesn't fall
+ back to the iterating over a sequence of key value pairs if the second
+ argument has no "keys" attribute. Return ``0`` on success or ``-1`` if an
+ exception was raised.
.. c:function:: int PyDict_MergeFromSeq2(PyObject *a, PyObject *seq2, int override)