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diff --git a/Documentation/rapidio/tsi721.txt b/Documentation/rapidio/tsi721.txt
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+++ b/Documentation/rapidio/tsi721.txt
@@ -46,6 +46,11 @@ fully compatible with RIONET driver (Ethernet over RapidIO messaging services).
0 = 128B, 1 = 256B, 2 = 512B, 3 = 1024B, 4 = 2048B and 5 = 4096B.
Default value is '-1' (= keep platform setting).
+- 'mbox_sel' - RIO messaging MBOX selection mask. This is a bitmask that defines
+ messaging MBOXes are managed by this device driver. Mask bits 0 - 3
+ correspond to MBOX0 - MBOX3. MBOX is under driver's control if the
+ corresponding bit is set to '1'. Default value is 0x0f (= all).
+
II. Known problems
None.