diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index 7073c25248b309a31bd6b51a2dffb48df2132d67..782404eb10b0c6ac5c04844f7ee99ea140251591 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -592,6 +592,7 @@ EXPORT_SYMBOL_GPL(tb_ring_alloc_rx);
 
 /**
  * tb_ring_start() - enable a ring
+ * @ring: Ring to start
  *
  * Must not be invoked in parallel with tb_ring_stop().
  */
@@ -667,6 +668,7 @@ EXPORT_SYMBOL_GPL(tb_ring_start);
 
 /**
  * tb_ring_stop() - shutdown a ring
+ * @ring: Ring to stop
  *
  * Must not be invoked from a callback.
  *