doc: mention trigger helper functions in CREATE TRIGGER docs

bmomjian · bmomjian · commit dd2bb77c72f4 · 2020-06-25T18:33:28.000-04:00
Reported-by: petermpallesen@gmail.com Discussion: https://postgr.es/m/159195294959.673.5752624528747900508@wrigleys.postgresql.org Backpatch-through: 9.5
diff --git a/doc/src/sgml/ref/create_trigger.sgml b/doc/src/sgml/ref/create_trigger.sgml
@@ -386,6 +386,12 @@ UPDATE OF <replaceable>column_name1</replaceable> [, <replaceable>column_name2</
    value did not change.
   </para>
 
+  <para>
+   There are a few built-in trigger functions that can be used to
+   solve common problems without having to write your own trigger code;
+   see <xref linkend="functions-trigger">.
+  </para>
+
   <para>
    In a <literal>BEFORE</> trigger, the <literal>WHEN</> condition is
    evaluated just before the function is or would be executed, so using
