diff --git a/docs/sources/articles/networking.md b/docs/sources/articles/networking.md
index 4bfbcfdade..9503f9be31 100644
--- a/docs/sources/articles/networking.md
+++ b/docs/sources/articles/networking.md
@@ -12,7 +12,9 @@ private range defined by [RFC 1918](http://tools.ietf.org/html/rfc1918)
 that are not in use on the host machine, and assigns it to `docker0`.
 Docker made the choice `172.17.42.1/16` when I started it a few minutes
 ago, for example — a 16-bit netmask providing 65,534 addresses for the
-host machine and its containers.
+host machine and its containers. Mac address is generated from ip to 
+avoid arp collisions and uses a range from 02:42:ac:11:00:00 to 
+02:42:ac:11:ff:ff.
 
 > **Note:**
 > This document discusses advanced networking configuration