diff --git a/doc/src/sgml/docguide.sgml b/doc/src/sgml/docguide.sgml
index 6ffa85f3be6f5c31e5f44d6645043e6108398661..95d00586aac4ab1c9c89f5b825004a2770e11459 100644
--- a/doc/src/sgml/docguide.sgml
+++ b/doc/src/sgml/docguide.sgml
@@ -272,7 +272,7 @@ CATALOG "docbook/4.2/catalog"
     available for <productname>Debian GNU/Linux</productname>.
     To install, simply use:
 <programlisting>
-apt-get install docbook docbook-dsssl docbook-xsl openjade1.3 xsltproc
+apt-get install docbook docbook-dsssl docbook-xsl openjade1.3 xsltproc opensp
 </programlisting>
    </para>
   </sect2>