diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index 4490e82aa52f3c0e2039047ab57194933d7c0275..d2951cd754c68237cd97eedd9c4353a671ad0995 100644
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -4222,7 +4222,7 @@ ALTER TABLE measurement ATTACH PARTITION measurement_y2008m02
<programlisting>
CREATE INDEX measurement_usls_idx ON ONLY measurement (unitsales);
-CREATE INDEX measurement_usls_200602_idx
+CREATE INDEX CONCURRENTLY measurement_usls_200602_idx
ON measurement_y2006m02 (unitsales);
ALTER INDEX measurement_usls_idx
ATTACH PARTITION measurement_usls_200602_idx;