Clarify wording on when ctid is modified by VACUUM FULL.

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index 6dd740fbfeeb42044c2d2fd8681c5cf3719b3583..6896b7b90b5bac9efb6d32629e885ee75c94853e 100644 (file)
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -1,4 +1,4 @@
-
+
 
 
  Data Definition
@@ -974,7 +974,7 @@ CREATE TABLE order_items (
       The physical location of the row version within its table.  Note that
       although the ctid can be used to
       locate the row version very quickly, a row's
-      ctid will change each time it is
+      ctid will change if it is
       updated or moved by VACUUM FULL.  Therefore
       ctid is useless as a long-term row
       identifier.  The OID, or even better a user-defined serial