diff --git a/Documentation/acpi-hotkey.txt b/Documentation/acpi-hotkey.txt
--- a/Documentation/acpi-hotkey.txt
+++ b/Documentation/acpi-hotkey.txt
@@ -33,3 +33,6 @@ The result of the execution of this aml 
 attached to /proc/acpi/hotkey/poll_method, which is dnyamically
 created.  Please use command "cat /proc/acpi/hotkey/polling_method" 
 to retrieve it.
+
+Note: Use cmdline "acpi_specific_hotkey" to enable legacy platform
+specific drivers.