doc/manuals/vty/sgsn_vty_additions.xml

<vtydoc xmlns='urn:osmocom:xml:libosmocore:vty:doc:1.0'>
    <node id='config-sgsn'>
	    <description>Configure the remote GGSN, access-control and other
	    attributes of the SGSN</description>
    </node>
</vtydoc>