diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c
index 806b8ce05624..2a3db9956229 100644
--- a/drivers/acpi/acpi_apd.c
+++ b/drivers/acpi/acpi_apd.c
@@ -34,6 +34,7 @@ struct apd_private_data;
  * @flags: device flags like %ACPI_APD_SYSFS, %ACPI_APD_PM
  * @fixed_clk_rate: fixed rate input clock source for acpi device;
  *			0 means no fixed rate input clock source
+ * @properties: build-in properties of the device such as UART
  * @setup: a hook routine to set device resource during create platform device
  *
  * Device description defined as acpi_device_id.driver_data