diff --git a/third_party/ddclient/default.nix b/third_party/ddclient/default.nix
index a3fcd639a..28b036ea6 100644
--- a/third_party/ddclient/default.nix
+++ b/third_party/ddclient/default.nix
@@ -1,3 +1,8 @@
+# Users of this package & module should replace it with something like
+# inadyn, after https://github.com/NixOS/nixpkgs/issues/242330 is
+# landed.
+#
+# TODO(aspen): replace ddclient with inadyn or something else.
 { pkgs, ... }:
 
 (pkgs.callPackage ./pkg.nix { }).overrideAttrs (old: {