diff --git a/doc/src/sgml/indices.sgml b/doc/src/sgml/indices.sgml
index 023157d888..2a70e02f7c 100644
--- a/doc/src/sgml/indices.sgml
+++ b/doc/src/sgml/indices.sgml
@@ -103,7 +103,9 @@ CREATE INDEX test1_id_index ON test1 (id);
 
   <para>
    After an index is created, the system has to keep it synchronized with the
-   table.  This adds overhead to data manipulation operations.
+   table.  This adds overhead to data manipulation operations.  Indexes can
+   also prevent the creation of <link linkend="storage-hot">heap-only
+   tuples</link>.
    Therefore indexes that are seldom or never used in queries
    should be removed.
   </para>