diff --git a/default.nix b/default.nix
index 7cb3705..26a7da6 100644
--- a/default.nix
+++ b/default.nix
@@ -1,7 +1,21 @@
-{ pkgs ? import <nixpkgs> {} }:
+{ pkgs ? import <nixpkgs> {}
+, silenceWarning ? false
+}:
 let
   inherit (pkgs) lib nix-gitignore python3 stdenv;
+
+  warning =
+    "This is a development build of nvd from git master.\n"
+    + "On or around Oct 19, 2024, nvd will be moving to Sourcehut.\n"
+    + "Please consider using the latest stable nvd release from nixpkgs,\n"
+    + "but if you wish to continue pulling the latest unstable pre-release\n"
+    + "code, you will need to update your URLs (and can do so now).\n"
+    + "See the following link for more info, thanks.\n\n"
+    + "https://gitlab.com/khumba/nvd/-/issues/19";
+
+  warn = if silenceWarning then lib.id else lib.warn warning;
 in
+warn (
 stdenv.mkDerivation {
   pname = "nvd";
   version = "0.2.4";
@@ -31,3 +45,4 @@ stdenv.mkDerivation {
     platforms = lib.platforms.all;
   };
 }
+)