diff --git a/src/include/access/xact.h b/src/include/access/xact.h
index 42b76cb4dd..9d2899dea1 100644
--- a/src/include/access/xact.h
+++ b/src/include/access/xact.h
@@ -239,7 +239,7 @@ typedef struct xl_xact_subxacts
 
 typedef struct xl_xact_relfilenodes
 {
-	int			nrels;			/* number of subtransaction XIDs */
+	int			nrels;			/* number of relations */
 	RelFileNode xnodes[FLEXIBLE_ARRAY_MEMBER];
 } xl_xact_relfilenodes;
 #define MinSizeOfXactRelfilenodes offsetof(xl_xact_relfilenodes, xnodes)