diff --git a/README.md b/README.md
index 55b0124..f54d20f 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,10 @@
 # mail.dumpstack.io
 
+[Download NixOS installation ISO](https://nixos.org/nixos/download.html)
+
 Note:
-1. Some cloud providers disallow outbound SMTP by default. Check it if
+1. I assume that latest **stable** (e.g. 20.09) ISO will be used for installation.
+2. Some cloud providers disallow outbound SMTP by default. Check it if
    there'll be issues with outgoing emails.
 
 ## Installation