D51938.id160442.diff
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	diff --git a/lib/libsys/copy_file_range.2.clone b/lib/libsys/copy_file_range.2
	--- a/lib/libsys/copy_file_range.2.clone
	+++ b/lib/libsys/copy_file_range.2
	@@ -23,7 +23,7 @@
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.
	.\"
	-.Dd December 28, 2023
	+.Dd August 16, 2025
	.Dt COPY_FILE_RANGE 2
	.Os
	.Sh NAME
	@@ -101,9 +101,33 @@
	or
	.Fa outfd
	respectively will not be affected.
	-The
	+The only
	.Fa flags
	-argument must be 0.
	+argument currently defined is
	+.Dv COPY_FILE_RANGE_CLONE .
	+When this flag is set,
	+.Fn copy_file_range
	+will return
	+.Er ENOSYS
	+if the copy cannot be done via
	+block cloning.
	+When
	+.Fa flags
	+is 0, a file system may do the copy via block cloning
	+or by data copying.
	+Block cloning is only possible when the offsets (plus
	+.Fa len
	+if not to EOF on the input file) are block
	+aligned.
	+The correct block alignment can normally be acquired via the
	+.Dv _PC_CLONE_BLKSIZE
	+name for
	+.Xr pathconf 2 .
	+Note that
	+.Dv COPY_FILE_RANGE_CLONE
	+is a
	+.Fx
	+specific flag and is not Linux compatible.
	.Pp
	This system call attempts to maintain holes in the output file for
	the byte range being copied.
	@@ -203,9 +227,15 @@
	File system that stores
	.Fa outfd
	is full.
	+.It Bq Er ENOSYS
	+Cannot do the copy via block cloning when the
	+.Dv COPY_FILE_RANGE_CLONE
	+.Fa flags
	+argument is specified.
	.El
	.Sh SEE ALSO
	-.Xr lseek 2
	+.Xr lseek 2 ,
	+.Xr pathconf 2
	.Sh STANDARDS
	The
	.Fn copy_file_range