diff --git a/modules/netcup-dns.nix b/modules/netcup-dns.nix
index 6ec0c40..2f255b2 100644
--- a/modules/netcup-dns.nix
+++ b/modules/netcup-dns.nix
@@ -31,7 +31,8 @@ in
   ];
 
   # Configure netcup-dns.
-  # Create file `/etc/netcup-dns/netcup-dns-95191.json`.
+  # This creates file `/etc/netcup-dns/netcup-dns-95191.json`.
+  # Update A and AAA entry of domains p1st.de, privacy1st.de, biketripplanner.de
   deployment.keys."netcup-dns-95191.json" = {
     keyFile = ../secrets/netcup-dns.json;
     destDir = "/etc/netcup-dns";