diff --git a/man/systemd.unit.xml b/man/systemd.unit.xml
index ec7ca5634e7..e9395ff16f3 100644
--- a/man/systemd.unit.xml
+++ b/man/systemd.unit.xml
@@ -1018,13 +1018,17 @@
                                 <varname>openvz</varname>,
                                 <varname>lxc</varname>,
                                 <varname>lxc-libvirt</varname>,
-                                <varname>systemd-nspawn</varname> to
-                                test against a specific
-                                implementation. If multiple
-                                virtualization technologies are nested,
-                                only the innermost is considered. The
-                                test may be negated by prepending an
-                                exclamation mark.</para>
+                                <varname>systemd-nspawn</varname>,
+                                <varname>docker</varname> to test
+                                against a specific implementation. See
+                                <citerefentry><refentrytitle>systemd-detect-virt</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+                                for a full list of known
+                                virtualization technologies and their
+                                identifiers. If multiple
+                                virtualization technologies are
+                                nested, only the innermost is
+                                considered. The test may be negated by
+                                prepending an exclamation mark.</para>
 
                                 <para><varname>ConditionHost=</varname>
                                 may be used to match against the