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diff --git a/Documentation/md.txt b/Documentation/md.txt
index 1dd0fb6021c..9710138d101 100644
--- a/Documentation/md.txt
+++ b/Documentation/md.txt
@@ -166,6 +166,14 @@ All md devices contain:
will be empty. If an array is being resized (not currently
possible) this will contain the larger of the old and new sizes.
+ chunk_size
+ This is the size if bytes for 'chunks' and is only relevant to
+ raid levels that involve striping (1,4,5,6,10). The address space
+ of the array is conceptually divided into chunks and consecutive
+ chunks are striped onto neighbouring devices.
+ The size should be atleast PAGE_SIZE (4k) and should be a power
+ of 2. This can only be set while assembling an array
+
As component devices are added to an md array, they appear in the 'md'
directory as new directories named
dev-XXX