diff --git a/doc/src/sgml/ref/merge.sgml b/doc/src/sgml/ref/merge.sgml
index f0745d01c7..cbb5b38a3e 100644
--- a/doc/src/sgml/ref/merge.sgml
+++ b/doc/src/sgml/ref/merge.sgml
@@ -23,27 +23,27 @@ MERGE INTO target_table_name [ [ AS
USING data_source ON join_condition
when_clause [...]
-where data_source is
+where data_source is:
{ source_table_name | ( source_query ) } [ [ AS ] source_alias ]
-and when_clause is
+and when_clause is:
{ WHEN MATCHED [ AND condition ] THEN { merge_update | merge_delete | DO NOTHING } |
WHEN NOT MATCHED [ AND condition ] THEN { merge_insert | DO NOTHING } }
-and merge_insert is
+and merge_insert is:
INSERT [( column_name [, ...] )]
[ OVERRIDING { SYSTEM | USER } VALUE ]
{ VALUES ( { expression | DEFAULT } [, ...] ) | DEFAULT VALUES }
-and merge_update is
+and merge_update is:
UPDATE SET { column_name = { expression | DEFAULT } |
( column_name [, ...] ) = ( { expression | DEFAULT } [, ...] ) } [, ...]
-and merge_delete is
+and merge_delete is:
DELETE