diff --git a/block/blk-merge.c b/block/blk-merge.c
index e41ea3318099366c360b41875c701bb496c8123c..1bce854790929a9c5ae0cfcf814059bad6f31413 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -210,7 +210,7 @@ static inline unsigned get_max_io_size(struct bio *bio,
  * get_max_segment_size() - maximum number of bytes to add as a single segment
  * @lim: Request queue limits.
  * @paddr: address of the range to add
- * @max_len: maximum length available to add at @paddr
+ * @len: maximum length available to add at @paddr
  *
  * Returns the maximum number of bytes of the range starting at @paddr that can
  * be added to a single segment.