diff --git a/doc/src/sgml/syntax.sgml b/doc/src/sgml/syntax.sgml
index feb73cf893e..0c724cb093f 100644
--- a/doc/src/sgml/syntax.sgml
+++ b/doc/src/sgml/syntax.sgml
@@ -1021,6 +1021,18 @@ CAST ( '<replaceable>string</replaceable>' AS <replaceable>type</replaceable> )
        <entry>unary plus, unary minus</entry>
       </row>
 
+      <row>
+       <entry><token>COLLATE</token></entry>
+       <entry>left</entry>
+       <entry>collation selection</entry>
+      </row>
+
+      <row>
+       <entry><token>AT</token></entry>
+       <entry>left</entry>
+       <entry><literal>AT TIME ZONE</literal></entry>
+      </row>
+
       <row>
        <entry><token>^</token></entry>
        <entry>left</entry>