Add documentation for system.ntfs_attrib_be extended attribute.

Signed-off-by: Daniel Pinto <danielpinto52@gmail.com>
---
 Documentation/filesystems/ntfs3.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/filesystems/ntfs3.rst b/Documentation/filesystems/ntfs3.rst
index d67ccd22c63b..fa6ca1babc60 100644
--- a/Documentation/filesystems/ntfs3.rst
+++ b/Documentation/filesystems/ntfs3.rst
@@ -25,6 +25,11 @@ versions up to 3.1. File system type to use on mount is *ntfs3*.
 	  Note: Applied to empty files, this allows to switch type between
 	  sparse(0x200), compressed(0x800) and normal.
 
+	- *system.ntfs_attrib_be* gets/sets ntfs file/dir attributes.
+
+	  Same value as system.ntfs_attrib but always represent as big-endian
+	  (endianness of system.ntfs_attrib is the same as of the CPU).
+
 Mount Options
 =============