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-rw-r--r--Documentation/block/null_blk.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/block/null_blk.txt b/Documentation/block/null_blk.txt
index 07f147381f32..ea2dafe49ae8 100644
--- a/Documentation/block/null_blk.txt
+++ b/Documentation/block/null_blk.txt
@@ -85,3 +85,10 @@ shared_tags=[0/1]: Default: 0
0: Tag set is not shared.
1: Tag set shared between devices for blk-mq. Only makes sense with
nr_devices > 1, otherwise there's no tag set to share.
+
+zoned=[0/1]: Default: 0
+ 0: Block device is exposed as a random-access block device.
+ 1: Block device is exposed as a host-managed zoned block device.
+
+zone_size=[MB]: Default: 256
+ Per zone size when exposed as a zoned block device. Must be a power of two.