diff --git a/doc/src/sgml/queries.sgml b/doc/src/sgml/queries.sgml
index f06afe2c3fb..dedb5684e63 100644
--- a/doc/src/sgml/queries.sgml
+++ b/doc/src/sgml/queries.sgml
@@ -1621,7 +1621,7 @@ SELECT DISTINCT ON (<replaceable>expression</replaceable> <optional>, <replaceab
 
 
  <sect1 id="queries-union">
-  <title>Combining Queries</title>
+  <title>Combining Queries (<literal>UNION</literal>, <literal>INTERSECT</literal>, <literal>EXCEPT</literal>)</title>
 
   <indexterm zone="queries-union">
    <primary>UNION</primary>
@@ -1701,7 +1701,7 @@ SELECT DISTINCT ON (<replaceable>expression</replaceable> <optional>, <replaceab
 
 
  <sect1 id="queries-order">
-  <title>Sorting Rows</title>
+  <title>Sorting Rows (<literal>ORDER BY</literal>)</title>
 
   <indexterm zone="queries-order">
    <primary>sorting</primary>