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-rw-r--r--Documentation/md.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/md.txt b/Documentation/md.txt
index df0b4551577..4cf5972821a 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -302,6 +302,9 @@ Each directory contains:
This includes spares that are in the process
of being recoverred to
This list make grow in future.
+ This can be written to.
+ Writing "faulty" simulates a failure on the device.
+ Writing "remove" removes the device from the array.
errors
An approximate count of read errors that have been detected on