diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 6671e2da0d572..d0ed1ef284a80 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -55,6 +55,7 @@ EXPORT_SYMBOL(mdiobus_alloc);
 
 /**
  * mdiobus_release - mii_bus device release callback
+ * @d: the target struct device that contains the mii_bus
  *
  * Description: called when the last reference to an mii_bus is
  * dropped, to free the underlying memory.