diff --git a/lisp/main.lisp b/lisp/main.lisp
deleted file mode 100644
index 2c4a5a411..000000000
--- a/lisp/main.lisp
+++ /dev/null
@@ -1,15 +0,0 @@
-(in-package #:cl-user)
-(defpackage #:utils
-  (:documentation "Some utility functions and macros to wet my beak.")
-  (:use #:cl)
-  (:shadow #:type))
-(in-package #:utils)
-
-(defmacro type (name in out)
-  `(declaim (ftype (function ,in ,out) ,name)))
-
-(defmacro comment (&rest _forms) nil)
-
-(type add (int int) int)
-(defun add (a b)
-  (+ a b))
diff --git a/lisp/prelude.lisp b/lisp/prelude.lisp
new file mode 100644
index 000000000..3522567ea
--- /dev/null
+++ b/lisp/prelude.lisp
@@ -0,0 +1,14 @@
+(in-package #:cl-user)
+(defpackage #:prelude
+  (:documentation "Supporting miscellaneous utility functions and macros.")
+  (:use #:cl)
+  (:shadow #:type)
+  (:export #:type #:comment))
+(in-package #:prelude)
+
+;; TODO: Add documentation to these macros.
+
+(defmacro type (name in out)
+  `(declaim (ftype (function ,in ,out) ,name)))
+
+(defmacro comment (&rest _forms) nil)
diff --git a/lisp/prelude.nix b/lisp/prelude.nix
new file mode 100644
index 000000000..9051f8239
--- /dev/null
+++ b/lisp/prelude.nix
@@ -0,0 +1,8 @@
+{ depot ? import <depot> {}, ... }:
+
+depot.nix.buildLisp.library {
+  name = "prelude";
+  srcs = [
+    ./prelude.lisp
+  ];
+}