diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index b4d8167b2f8d..df68d29740a0 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -1500,6 +1500,7 @@ static void swiotlb_release_slots(struct device *dev, phys_addr_t tlb_addr,
  * swiotlb_del_transient() - delete a transient memory pool
  * @dev:	Device which mapped the buffer.
  * @tlb_addr:	Physical address within a bounce buffer.
+ * @pool:       Pointer to the transient memory pool to be checked and deleted.
  *
  * Check whether the address belongs to a transient SWIOTLB memory pool.
  * If yes, then delete the pool.