diff --git a/configuration/multicast.rst b/configuration/multicast.rst
index 3d34bf0..63fd4c9 100644
--- a/configuration/multicast.rst
+++ b/configuration/multicast.rst
@@ -13,6 +13,7 @@
 - Support **multiple sources**
 
 .. image:: ../images/config-mcast.png
+    :width: 1000px
 
 .. note::
     Dual-homed sinks and multiple sources support comes with major changes in the Multicast Routing subsystem.
@@ -26,6 +27,9 @@
         :width: 600px
         :align: center
 
+.. caution::
+  We should avoid using reserved Multicast groups. Please check here for the reserved values: http://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml
+
 
 Activate Multicast
 ------------------