diff --git a/doc/src/sgml/ref/create_function.sgml b/doc/src/sgml/ref/create_function.sgml
index 8632a76..fb8a42d 100644
--- a/doc/src/sgml/ref/create_function.sgml
+++ b/doc/src/sgml/ref/create_function.sgml
@@ -673,6 +673,11 @@ SELECT * FROM dup(42);
  <refsect1 id="sql-createfunction-security">
   <title>Writing <literal>SECURITY DEFINER</literal> Functions Safely</title>
 
+   <indexterm>
+      <primary>search_path</>
+      <secondary>securing functions</>
+   </indexterm>
+
    <para>
     Because a <literal>SECURITY DEFINER</literal> function is executed
     with the privileges of the user that created it, care is needed to