man: systemd.slice: add link to cgroups api docs

systemd.scope and systemd.resource-control contain that link.
systemd.slice should contain it too.

diff --git a/man/systemd.slice.xml b/man/systemd.slice.xml
index a50132733599098589425a3929ec433cde10cb8e..87c2a3bce3aa6b45ebd49d6c0c600c2c5b12a0e4 100644 (file)
--- a/man/systemd.slice.xml
+++ b/man/systemd.slice.xml
@@ -93,6 +93,11 @@
     <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry> are allowed.
     </para>
 
+    <para>See the <ulink
+    url="http://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/">New
+    Control Group Interfaces</ulink> for an introduction on how to make
+    use of slice units from programs.</para>
+
     <para>Unless <varname>DefaultDependencies=false</varname>
     is used, slice units will implicitly have dependencies of
     type <varname>Conflicts=</varname> and