diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 349b44d699e2..c2c08c1b316b 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -658,6 +658,9 @@ static unsigned long damon_va_apply_scheme(struct damon_ctx *ctx,
 	case DAMOS_STAT:
 		return 0;
 	default:
+		/*
+		 * DAMOS actions that are not yet supported by 'vaddr'.
+		 */
 		return 0;
 	}