<varname>uml</varname>,
<varname>openvz</varname>, <varname>lxc</varname>,
<varname>lxc-libvirt</varname>,
- <varname>systemd-nspawn</varname>.</para>
+ <varname>systemd-nspawn</varname>,
+ <varname>docker</varname>.</para>
<para>If multiple virtualization solutions are used,
only the "innermost" is detected and identified. That