diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 085f3aa..b1697a3 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -161,6 +161,7 @@
  * @dev: the device structure
  * @cl: client
  * @hbm_cmd: host bus message command
+ * @buf: message buffer
  * @len: buffer length
  *
  * Return: 0 on success, <0 on failure.