#6430: add note about size of "u" type.
diff --git a/Doc/library/array.rst b/Doc/library/array.rst
index 3b247b7..f48bf06 100644
--- a/Doc/library/array.rst
+++ b/Doc/library/array.rst
@@ -24,7 +24,7 @@
+-----------+----------------+-------------------+-----------------------+
| ``'B'`` | unsigned char | int | 1 |
+-----------+----------------+-------------------+-----------------------+
-| ``'u'`` | Py_UNICODE | Unicode character | 2 |
+| ``'u'`` | Py_UNICODE | Unicode character | 2 (see note) |
+-----------+----------------+-------------------+-----------------------+
| ``'h'`` | signed short | int | 2 |
+-----------+----------------+-------------------+-----------------------+
@@ -43,6 +43,11 @@
| ``'d'`` | double | float | 8 |
+-----------+----------------+-------------------+-----------------------+
+.. note::
+
+ The ``'u'`` typecode corresponds to Python's unicode character. On narrow
+ Unicode builds this is 2-bytes, on wide builds this is 4-bytes.
+
The actual representation of values is determined by the machine architecture
(strictly speaking, by the C implementation). The actual size can be accessed
through the :attr:`itemsize` attribute. The values stored for ``'L'`` and