-.PP
-The 'X' attribute is used by the experimental compression patches to
-indicate that the raw contents of a compressed file can be accessed
-directly. It currently may not be set or reset using
-.BR chattr (1),
-although it can be displayed by
-.BR lsattr (1).
-.PP
-The 'Z' attribute is used by the experimental compression patches to
-indicate a compressed file is dirty. It may not be set or reset using
+.TP
+.B x
+The 'x' attribute can be set on a directory or file. If the attribute
+is set on an existing directory, it will be inherited by all files and
+subdirectories that are subsequently created in the directory. If an
+existing directory has contained some files and subdirectories, modifying
+the attribute on the parent directory doesn't change the attributes on
+these files and subdirectories.
+.TP
+.B V
+A file with the 'V' attribute set has fs-verity enabled. It cannot be
+written to, and the filesystem will automatically verify all data read
+from it against a cryptographic hash that covers the entire file's
+contents, e.g. via a Merkle tree. This makes it possible to efficiently
+authenticate the file. This attribute may not be set or cleared using