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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 0a2e10a4040d..c5512afd5917 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -183,6 +183,12 @@ All md devices contain:
the array if the personality supports it (raid1, raid5, raid6),
and if the component drives are large enough.
+ metadata_version
+ This indicates the format that is being used to record metadata
+ about the array. It can be 0.90 (traditional format), 1.0, 1.1,
+ 1.2 (newer format in varying locations) or "none" indicating that
+ the kernel isn't managing metadata at all.
+
As component devices are added to an md array, they appear in the 'md'
directory as new directories named
dev-XXX