comment fixes

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index e64fb48ccb5eb3a3ced54ea8b409e3283270d959..6b687911203decb6cf6396ff735eca9350b8e299 100644 (file)
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -115,8 +115,8 @@ CheckpointStatsData CheckpointStats;
 
 /*
  * ThisTimeLineID will be same in all backends --- it identifies current
- * WAL timeline for the database system. Zero is always a bug, so we 
- * start with that to allow us to spot any errors.
+ * WAL timeline for the database system. Zero is never valid, so we start
+ * with that to spot any errors.
  */
 TimeLineID     ThisTimeLineID = 0;