diff --git a/mm/zbud.c b/mm/zbud.c
index 48e80a3f7976..6348932430b8 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -92,6 +92,8 @@ struct zbud_ops {
  * @pages_nr:	number of zbud pages in the pool.
  * @ops:	pointer to a structure of user defined operations specified at
  *		pool creation time.
+ * @zpool:	zpool driver
+ * @zpool_ops:	zpool operations structure with an evict callback
  *
  * This structure is allocated at pool creation time and maintains metadata
  * pertaining to a particular zbud pool.