1 files changed, 4 insertions, 2 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 8fd5aa40585f..8ea41b6e6a85 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -147,8 +147,10 @@ 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 }
-                        See Documentation/power/video.txt
+                        Format: { s3_bios, s3_mode, s3_beep }
+                        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.
 
         acpi_sci=       [HW,ACPI] ACPI System Control Interrupt trigger mode
                         Format: { level | edge | high | low }