diff --git a/README.md b/README.md
index 0694229..7ba39f3 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,9 @@ If OS image is mounted to the Docker container as read-only
 it is first copied during Docker container launch.
 Specify MAC address via environment variable `MAC`.
 For more example see `docker-compose.yml`
+You probably need the machines to come up with
+fixed IP-s. Use static leases on your DHCP server
+to assign the IP addresses to the VM-s.
 
 
 # Windows template image preparation