diff --git a/doc/src/sgml/docguide.sgml b/doc/src/sgml/docguide.sgml
index 6ffa85f3be..95d00586aa 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>