Clarify that pg_trgm is used in example

Reported-by: Octopus ZHANG
Author: Daniel Gustafsson

diff --git a/doc/src/sgml/rules.sgml b/doc/src/sgml/rules.sgml
index 2610645663f009742ff9c3731ba0028d29a53053..bcf860b68b9c2e5acf5d681af71251dd51530e27 100644 (file)
--- a/doc/src/sgml/rules.sgml
+++ b/doc/src/sgml/rules.sgml
@@ -1039,7 +1039,8 @@ SELECT count(*) FROM words WHERE word = 'caterpiler';
 </programlisting>
 
     Either way, the word is spelled wrong, so let's look for what we might
-    have wanted.  Again using <literal>file_fdw</literal>:
+    have wanted.  Again using <literal>file_fdw</literal> and
+    <literal>pg_trgm</literal>:
 
 <programlisting>
 SELECT word FROM words ORDER BY word &lt;-&gt; 'caterpiler' LIMIT 10;