It's already marked as deprecated in cmd_device_scan_usage().

commit 5444864e5605 ("btrfs-progs: remove BTRFS_SCAN_PROC scan method")

Signed-off-by: Satoru Takeuchi <takeuchi_sat...@jp.fujitsu.com>
---
 Documentation/btrfs-device.asciidoc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/btrfs-device.asciidoc 
b/Documentation/btrfs-device.asciidoc
index bd878f4..bf16a94 100644
--- a/Documentation/btrfs-device.asciidoc
+++ b/Documentation/btrfs-device.asciidoc
@@ -89,8 +89,8 @@ Scan devices for a btrfs filesystem.
 If one or more devices are passed, these are scanned for a btrfs filesystem.
 If no devices are passed, btrfs uses block devices containing btrfs
 filesystem as listed by blkid.
-Finally, if '--all-devices' or '-d' is passed, all the devices under /dev are
-scanned.
+Finally, '--all-devices' or '-d' is the deprecated option. If it is passed,
+its behavior is the same as if no devices are passed.

 *stats* [-z] <path>|<device>::
 Read and print the device IO stats for all mounted devices of the filesystem
-- 
2.7.0
--
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