diff --git a/root/defaults/dns-conf/netcup.ini b/root/defaults/dns-conf/netcup.ini
index a3a1e90..5ed7be3 100644
--- a/root/defaults/dns-conf/netcup.ini
+++ b/root/defaults/dns-conf/netcup.ini
@@ -1,3 +1,5 @@
+# Recommended PROPAGATION value in environment for netcup is 900
+
 dns_netcup_customer_id  = 123456
 dns_netcup_api_key      = 0123456789abcdef0123456789abcdef01234567
 dns_netcup_api_password = abcdef0123456789abcdef01234567abcdef0123