1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 711c321a7011..092dbd0e7658 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -70,7 +70,8 @@ typedef void (bio_destructor_t) (struct bio *);
  * stacking drivers)
  */
 struct bio {
-        sector_t                bi_sector;
+        sector_t                bi_sector;      /* device address in 512 byte
+                                                   sectors */
         struct bio              *bi_next;       /* request queue link */
         struct block_device     *bi_bdev;
         unsigned long           bi_flags;       /* status, command, etc */