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diff --git a/Documentation/md.txt b/Documentation/md.txt
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@@ -392,6 +392,13 @@ also have
achieved. In that case, the transition to "recover" isn't
notified, but the transition away is.
+ degraded
+ This contains a count of the number of devices by which the
+ arrays is degraded. So an optimal array with show '0'. A
+ single failed/missing drive will show '1', etc.
+ This file responds to select/poll, any increase or decrease
+ in the count of missing devices will trigger an event.
+
mismatch_count
When performing 'check' and 'repair', and possibly when
performing 'resync', md will count the number of errors that are