1 files changed, 5 insertions, 1 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9cf7b34f2db0..18d793ea0dd3 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -147,10 +147,14 @@ and is between 256 and 4096 characters. It is defined in the file
                         default: 0
 
         acpi_sleep=     [HW,ACPI] Sleep options
-                        Format: { s3_bios, s3_mode, s3_beep }
+                        Format: { s3_bios, s3_mode, s3_beep, old_ordering }
                         See Documentation/power/video.txt for s3_bios and s3_mode.
                         s3_beep is for debugging; it makes the PC's speaker beep
                         as soon as the kernel's real-mode entry point is called.
+                        old_ordering causes the ACPI 1.0 ordering of the _PTS
+                        control method, wrt putting devices into low power
+                        states, to be enforced (the ACPI 2.0 ordering of _PTS is
+                        used by default).
 
         acpi_sci=       [HW,ACPI] ACPI System Control Interrupt trigger mode
                         Format: { level | edge | high | low }