1 files changed, 6 insertions, 0 deletions

diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt
index 142a14fa1d91..fe26e50a2b15 100644
--- a/Documentation/thinkpad-acpi.txt
+++ b/Documentation/thinkpad-acpi.txt
@@ -227,6 +227,12 @@ sysfs notes:
                 supported hot keys, except those which are handled by
                 the firmware.  Echo it to hotkey_mask above, to use.
 
+        hotkey_radio_sw:
+                if the ThinkPad has a hardware radio switch, this
+                attribute will read 0 if the switch is in the "radios
+                disabled" postition, and 1 if the switch is in the
+                "radios enabled" position.
+
 
 Bluetooth
 ---------