diff --git a/modules/webstack.nix b/modules/webstack.nix
index 770391a..dbb90ac 100644
--- a/modules/webstack.nix
+++ b/modules/webstack.nix
@@ -89,6 +89,7 @@
         useACMEHost = "coolneng.duckdns.org";
         forceSSL = true;
         listen = [
+          # IPv4
           {
             addr = "0.0.0.0";
             port = 8448;