update overlayfs and aufs in lxc.container.conf

Explain that multiple /lower layers can be used.

Signed-off-by: Christian Brauner <christian.brauner@mailbox.org>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>

diff --git a/doc/lxc.container.conf.sgml.in b/doc/lxc.container.conf.sgml.in
index 92de571d7ec0301ab4fe1ea1906eb0ed4d26a69e..5d8d89eee579e015ad70e8a6594e0cacdfaaf043 100644 (file)
--- a/doc/lxc.container.conf.sgml.in
+++ b/doc/lxc.container.conf.sgml.in
@@ -1048,7 +1048,9 @@ proc proc proc nodev,noexec,nosuid 0 0
           specifies that the rootfs should be an overlay with <filename>/upper</filename>
           being mounted read-write over a read-only mount of <filename>/lower</filename>.
           <filename>aufs:/lower:/upper</filename> does the same using aufs in place
-          of overlayfs. <filename>loop:/file</filename> tells lxc to attach
+          of overlayfs. For both <filename>overlayfs</filename> and
+          <filename>aufs</filename> multiple <filename>/lower</filename>
+          directories can be specified. <filename>loop:/file</filename> tells lxc to attach
           <filename>/file</filename> to a loop device and mount the loop device.
             </para>
           </listitem>