diff --git a/lib/nixfiles/default.nix b/lib/nixfiles/default.nix
new file mode 100644
index 0000000..3551628
--- /dev/null
+++ b/lib/nixfiles/default.nix
@@ -0,0 +1,7 @@
+pkgs:
+let
+  inherit (pkgs) lib;
+in
+{
+  types = (import ./types.nix) pkgs;
+}
diff --git a/lib/nixfiles/types.nix b/lib/nixfiles/types.nix
new file mode 100644
index 0000000..263d457
--- /dev/null
+++ b/lib/nixfiles/types.nix
@@ -0,0 +1,13 @@
+pkgs:
+let
+  inherit (pkgs) lib;
+  inherit (lib.types) mkOptionType;
+  inherit (lib.options) mergeEqualOption;
+in
+{
+  flake = mkOptionType {
+    name="flake";
+    description="Nix flake";
+    descriptionClass = "noun";
+    merge = mergeEqualOption; check = (value: value._type or "" == "flake"); };
+}