diff --git a/README.md b/README.md
index b11acb7..ce23840 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,13 @@
+# use 'nm' for network-manager and dummy0 iface for BGP IPs
+# use 'network-scripts' for network-scripts and lo iface for BGP IPs
+
+     network: "nm"
+     network_nm_iface: "dummy0"
+
+# null for auto
+   
+     network_nm_iface_mtu: null
+
 Config example:
 
     bird: