diff --git a/README.md b/README.md
index 4adc348..2bcd963 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,9 @@
 # hetzner-ddns-for-mikrotik
 
-This Mikrotik RouterOS script for updating DNS entries via Hetzner's DNS API.
+This Mikrotik RouterOS **7** script for updating DNS entries via Hetzner's DNS API.
+
+The script is currently only compatible with **RouterOS 7**!  
+RouterOS 6 is currently not supported.
 
 ## Table of Contents
 
diff --git a/ddns-hetzner.rsc b/ddns-hetzner.rsc
index 1aefa4d..ec31e7e 100755
--- a/ddns-hetzner.rsc
+++ b/ddns-hetzner.rsc
@@ -5,6 +5,8 @@
 # Version 1.0
 # last update: 10.11.2023
 # License: MIT
+#
+# Compatibility: RouterOS 7
 # -------------------------------------------------------------------------------