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-rw-r--r--Documentation/md.txt8
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diff --git a/Documentation/md.txt b/Documentation/md.txt
index 7b3d471bb9f0..b8d172b254f7 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -200,6 +200,14 @@ All md devices contain:
This can be written only while the array is being assembled, not
after it is started.
+ new_dev
+ This file can be written but not read. The value written should
+ be a block device number as major:minor. e.g. 8:0
+ This will cause that device to be attached to the array, if it is
+ available. It will then appear at md/dev-XXX (depending on the
+ name of the device) and further configuration is then possible.
+
+
As component devices are added to an md array, they appear in the 'md'
directory as new directories named
dev-XXX