diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index 32ee0fc7ea54587241f7f3ac22ffc679e0b371de..f0077cb8e249e5f0fac3ef302d9a1ded177a479b 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -55,6 +55,7 @@
  * @rate:	Frequency in hertz
  * @u_volt:	Nominal voltage in microvolts corresponding to this OPP
  * @dev_opp:	points back to the device_opp struct this opp belongs to
+ * @head:	RCU callback head used for deferred freeing
  *
  * This structure stores the OPP information for a given device.
  */