diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 6780869..26d7e39 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1503,8 +1503,9 @@ $ <userinput>kill -INT `head -1 /usr/local/pgsql/data/postmaster.pid`</userinput
    <listitem>
     <para>
      The <filename>contrib</> function library
-     <function>pgcrypto</function> allows certain fields to be stored
-     encrypted. This is useful if only some of the data is sensitive.
+     <link linkend="pgcrypto"><function>pgcrypto</function></link>
+     allows certain fields to be stored encrypted.
+     This is useful if only some of the data is sensitive.
      The client supplies the decryption key and the data is decrypted
      on the server and then sent to the client.
     </para>