diff --git a/modules/lamassu-lnbits.nix b/modules/lamassu-lnbits.nix
index dd2de20..82fbbd5 100644
--- a/modules/lamassu-lnbits.nix
+++ b/modules/lamassu-lnbits.nix
@@ -114,10 +114,16 @@ in
     hostname = mkOption {
       type = types.str;
       default = "localhost";
-      description = "Hostname for the server (used by application)";
+      description = ''
+        Hostname for the server. This is embedded in the pairing QR code
+        and tells ATMs where to connect. Can be an IP address or domain name.
+      '';
     };
 
     # Certificate options (same pattern as LND)
+    # TODO: When using an IP address, hostname and certificate.extraIPs are redundant.
+    # Consider auto-populating certificate.extraIPs from hostname if it's an IP,
+    # or unifying these options. For now, set both to the same IP address.
     certificate = {
       extraIPs = mkOption {
         type = with types; listOf str;