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Armin Rigo committed 7885fd1

Add a reminder.

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doc/source/index.rst

 the array.  Getting a buffer is useful because you can read from it
 without an extra copy, or write into it to change the original value;
 you can use for example ``file.write()`` and ``file.readinto()`` with
-such a buffer (for files opened in binary mode).
+such a buffer (for files opened in binary mode).  (Remember that like in
+C, you use ``array + index`` to get the pointer to the index'th item of
+an array.)
 
 ``ffi.typeof("C type" or cdata object)``: return an object of type
 ``<ctype>`` corresponding to the parsed string, or to the C type of the