Add missing article

Noticed while reviewing nearby text

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index bee1ebd7dbc2a33090d7a6bc22bba77954d9a972..8c3be5b103ce466867440a510cb455133d94e4b4 100644 (file)
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -3078,7 +3078,7 @@ CREATE TABLE measurement (
        parent.  Note that specifying bounds such that the new partition's
        values will overlap with those in one or more existing partitions will
        cause an error.  Inserting data into the parent table that does not map
-       to one of the existing partitions will cause an error; appropriate
+       to one of the existing partitions will cause an error; an appropriate
        partition must be added manually.
       </para>