diff --git a/TODO.md b/TODO.md
index 6e7e0e7..46c5e04 100644
--- a/TODO.md
+++ b/TODO.md
@@ -7,3 +7,7 @@ create NixOS VM test
 - test that ghidra-svrAdmin works as an unprivileged user in the `ghidra` group
 - possibly test remotely importing a binary. however, ghidra-svrAdmin working is a good indicator of
     the server being functional
+
+## general
+
+- meta info / license info for pkgs
diff --git a/default.nix b/default.nix
index 734c209..58a5ac2 100644
--- a/default.nix
+++ b/default.nix
@@ -16,6 +16,13 @@
       ocamlPackages = prev.ocamlPackages.overrideScope (ofinal: oprev: {
         xlog = ofinal.callPackage ./pkgs/ocaml/xlog {};
       });
+
+      python312Packages = prev.python312Packages.overrideScope (pfinal: pprev: {
+        feedvalidator = pfinal.callPackage ./pkgs/python/feedvalidator {};
+      });
+
+      # add to top level because it has a binary
+      feedvalidator = final.python312Packages.feedvalidator;
     })
   ];
 }
diff --git a/pkgs/python/feedvalidator/bin.py b/pkgs/python/feedvalidator/bin.py
new file mode 100644
index 0000000..ddc6088
--- /dev/null
+++ b/pkgs/python/feedvalidator/bin.py
@@ -0,0 +1,25 @@
+import argparse
+import sys
+
+from . import compatibility, validateStream
+from .formatter.text_plain import Formatter
+
+
+def main():
+    parser = argparse.ArgumentParser(description="W3C feedvalidator")
+    parser.add_argument("-b", "--base", type=str, required=False, default="",
+                        help="Base URL of document")
+    parser.add_argument("file", type=argparse.FileType("rb"), help="File to validate")
+    args = parser.parse_args()
+
+    events = validateStream(args.file, base=args.base)['loggedEvents']
+    events = compatibility.AA(events)
+    fmt = Formatter(events)
+    if len(fmt) > 0:
+        for f in fmt:
+            print(f)
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/pkgs/python/feedvalidator/default.nix b/pkgs/python/feedvalidator/default.nix
new file mode 100644
index 0000000..9a4c365
--- /dev/null
+++ b/pkgs/python/feedvalidator/default.nix
@@ -0,0 +1,61 @@
+{
+  lib,
+  fetchFromGitHub,
+  stdenvNoCC,
+  buildPythonPackage,
+
+  setuptools,
+  wheel,
+
+  lxml,
+  html5lib,
+  rdflib
+}:
+
+let feedvalidator_src = stdenvNoCC.mkDerivation {
+  name = "feedvalidator-src";
+
+  src = fetchFromGitHub {
+    owner = "w3c";
+    repo = "feedvalidator";
+    rev = "1bbf6d9c68ef074b824c452fbc5d1f7817e6adae";
+    sha256 = "sha256-sHc6cgjSNcd0BcYYeybGPayQNV8SK9GjUglWg9iOQko=";
+  };
+
+  installPhase = ''
+    mkdir -p "$out"
+    cp -r src/feedvalidator/ "$out"
+    cp "${./bin.py}" "$out/feedvalidator/bin.py"
+    cp requirements.txt "$out"
+    cat > "$out"/pyproject.toml <<EOF
+    [build-system]
+    requires = ["setuptools>=60", "wheel"]
+    build-backend = "setuptools.build_meta"
+    [project]
+    name = "feedvalidator"
+    version = "0.0.1+git"
+    requires-python = ">=3.11"
+    dynamic = ["dependencies"]
+    [project.scripts]
+    feedvalidator = "feedvalidator.bin:main"
+    [tool.setuptools.dynamic]
+    dependencies = {file = ["requirements.txt"]}
+    EOF
+  '';
+};
+in buildPythonPackage rec {
+  pname = "feedvalidator";
+  version = "git";
+  pyproject = true;
+
+  src = feedvalidator_src;
+
+  nativeBuildInputs = [ setuptools wheel ];
+
+  # this should match requirements.txt
+  propagatedBuildInputs = [ lxml html5lib rdflib ];
+
+  doCheck = false;
+
+  pythonImportsCheck = [ "feedvalidator" ];
+}