Document why pg_upgrade preserves pg_auth.oid (because they are stored

in pg_largeobject_metadata).

diff --git a/contrib/pg_upgrade/pg_upgrade.c b/contrib/pg_upgrade/pg_upgrade.c
index 42da3ea..331ade1 100644 (file)
--- a/contrib/pg_upgrade/pg_upgrade.c
+++ b/contrib/pg_upgrade/pg_upgrade.c
@@ -28,6 +28,9 @@
  *
  *     We control all assignments of pg_enum.oid because these oids are stored
  *     in user tables as enum values.
+ *
+ *     We control all assignments of pg_auth.oid because these oids are stored
+ *     in pg_largeobject_metadata.
  */