From: Robert Haas <rhaas@postgresql.org>
Date: Thu, 14 Jun 2012 14:34:44 +0000 (-0400)
Subject: Comment fix.
X-Git-Url: http://git.postgresql.org/gitweb/static/developers.postgresql.org?a=commitdiff_plain;h=ec7d01bee948cb4d4214b393bbd51031915e8d7f;p=users%2Frhaas%2Fpostgres.git

Comment fix.
---

diff --git a/src/include/access/gist.h b/src/include/access/gist.h
index 9f4e2de078..5791178316 100644
--- a/src/include/access/gist.h
+++ b/src/include/access/gist.h
@@ -141,8 +141,9 @@ typedef struct GISTENTRY
 /*
  * Prior to PostgreSQL 9.3, the F_ROOT flag did not exist; the root page was
  * at a fixed location, GIST_OLD_ROOT_BLKNO.  This block now contains the
- * metapage.  The correct test for whether you've got the root block is
- * therefore blkno == 0 || GistPageIsRoot(page).
+ * metapage.  To accommodate pg_upgrade from earlier server versions, the
+ * correct test for whether you've got the root block is therefore blkno == 0
+ * || GistPageIsRoot(page).
  */
 #define GistPageIsRoot(page)	( GistPageGetOpaque(page)->flags & F_ROOT)