diff --git a/src/notes.txt b/src/notes.txt
new file mode 100644
index 0000000..3ae8c3d
--- /dev/null
+++ b/src/notes.txt
@@ -0,0 +1,4 @@
+VERSION = "140.4.0esr"
+
+LINK = ftp.mozilla.org/pub/firefox/releases/$VERSION/source/firefox-$VERSION.source.tar.xz/
+// (add .asc for hash)
\ No newline at end of file
diff --git a/src/shell.nix b/src/shell.nix
new file mode 100644
index 0000000..af140e8
--- /dev/null
+++ b/src/shell.nix
@@ -0,0 +1,13 @@
+{ pkgs ? import <nixpkgs> {} }:
+  pkgs.mkShell {
+    # nativeBuildInputs is usually what you want -- tools you need to run
+    nativeBuildInputs = with pkgs.buildPackages; [ 
+
+        ];
+    
+    shellHook = ''
+
+    
+
+    '';
+}
\ No newline at end of file