diff --git a/include/linux/libata.h b/include/linux/libata.h
index 22aa69e20905..91bb8ceef0b5 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1054,6 +1054,8 @@ static inline void ata_pause(struct ata_port *ap)
 /**
  *	ata_busy_wait - Wait for a port status register
  *	@ap: Port to wait for.
+ *	@bits: bits that must be clear
+ *	@max: number of 10uS waits to perform
  *
  *	Waits up to max*10 microseconds for the selected bits in the port's
  *	status register to be cleared.