diff --git a/src/hnswvacuum.c b/src/hnswvacuum.c
index e1b03c2..c4a777c 100644
--- a/src/hnswvacuum.c
+++ b/src/hnswvacuum.c
@@ -529,7 +529,7 @@ MarkDeleted(HnswVacuumState * vacuumstate)
 
 			/* Increment version */
 			/* This is used to avoid incorrect reads for iterative scans */
-			/* Only use some bits */
+			/* Reserve some bits for future use */
 			etup->version++;
 			if (etup->version > 15)
 				etup->version = 1;