diff --git a/etc/nova/nova.conf.sample b/etc/nova/nova.conf.sample
index a7edd458d3..6bb7a42745 100644
--- a/etc/nova/nova.conf.sample
+++ b/etc/nova/nova.conf.sample
@@ -1221,7 +1221,9 @@
 #force_dhcp_release=true
 
 # If True in multi_host mode, all compute hosts share the same
-# dhcp address. (boolean value)
+# dhcp address. The same IP address used for DHCP will be
+# added on each nova-network node which is only visible to the
+# vms on the same host. (boolean value)
 #share_dhcp_address=false
 
 # If True, when a DNS entry must be updated, it sends a fanout
diff --git a/nova/network/manager.py b/nova/network/manager.py
index 24e73b05a8..1af1ddd07d 100644
--- a/nova/network/manager.py
+++ b/nova/network/manager.py
@@ -143,7 +143,9 @@ network_opts = [
     cfg.BoolOpt('share_dhcp_address',
                 default=False,
                 help='If True in multi_host mode, all compute hosts share '
-                     'the same dhcp address.'),
+                     'the same dhcp address. The same IP address used for '
+                     'DHCP will be added on each nova-network node which '
+                     'is only visible to the vms on the same host.'),
     cfg.BoolOpt('update_dns_entries',
                 default=False,
                 help='If True, when a DNS entry must be updated, it sends a '