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-rw-r--r--Documentation/md.txt6
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diff --git a/Documentation/md.txt b/Documentation/md.txt
index dca97ba4944..c05bfb55659 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -386,6 +386,12 @@ also have
'check' and 'repair' will start the appropriate process
providing the current state is 'idle'.
+ This file responds to select/poll. Any important change in the value
+ triggers a poll event. Sometimes the value will briefly be
+ "recover" if a recovery seems to be needed, but cannot be
+ achieved. In that case, the transition to "recover" isn't
+ notified, but the transition away is.
+
mismatch_count
When performing 'check' and 'repair', and possibly when
performing 'resync', md will count the number of errors that are