diff --git a/doc/src/sgml/storage.sgml b/doc/src/sgml/storage.sgml
index 6b6377503bf..19924b98d71 100644
--- a/doc/src/sgml/storage.sgml
+++ b/doc/src/sgml/storage.sgml
@@ -797,7 +797,7 @@ data. Empty in ordinary tables.
(PageHeaderData). Its format is detailed in . The first field tracks the most
recent WAL entry related to this page. The second field contains
- the page checksum if are
+ the page checksum if data checksums are
enabled. Next is a 2-byte field containing flag bits. This is followed
by three 2-byte integer fields (pd_lower,
pd_upper, and