diff --git a/repo.nix b/repo.nix
index f57106a..5074ef2 100644
--- a/repo.nix
+++ b/repo.nix
@@ -2,9 +2,22 @@
 
 let
   inherit (lib)
-    types;
+    types mkOption;
 in
 types.attrsOf (types.submodule ({ ... }: {
-  options = { };
-  config = { };
+  options = {
+    url = mkOption {
+      type = types.str;
+      description = ''
+        Url of git repo to clone
+      '';
+    };
+
+    extraArgs = mkOption {
+      type = types.str;
+      description = ''
+        Args to be used with the `git clone` command
+      '';
+    };
+  };
 }))