diff --git a/src/gc.c b/src/gc.c
index ccca2401b3c38..5a593da0cf528 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -685,7 +685,7 @@ static int mark_reset_age = 0;
  *
  * <-[(quick)sweep]-
  *                 |
- *     ---->  GC_OLD  <-----------------------------------
+ *     ---->  GC_OLD  <--[(quick)sweep]-------------------
  *     |     |                                           |
  *     |     |  GC_MARKED (in remset)                    |
  *     |     |     ^            |                        |