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diff --git a/users/wpcarro/lisp/README.md b/users/wpcarro/lisp/README.md
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+# Common Lisp
+
+Things that I like about Common Lisp:
+- It's an S-expression based language.
+- It has a powerful macro system
+- It has a unique way of handling-errors
+- It is highly introspectible
+- The tooling integration with Emacs is the best I have ever seen for any language
+
+Things that I don't like about Common Lisp:
+- I find its standard libraries difficult to use and -- compared to modern
+  libraries -- like Golang's or Elixir's standard libraries, Common Lisp's
+  libraries are clunky
+
+As such, I would like to modernize CL's libraries to resemble other libraries
+with which I am more familiar and, therefore, productive.
diff --git a/users/wpcarro/lisp/prelude.lisp b/users/wpcarro/lisp/prelude.lisp
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+(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/users/wpcarro/lisp/prelude.nix b/users/wpcarro/lisp/prelude.nix
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+{ depot, ... }:
+
+depot.nix.buildLisp.library {
+  name = "prelude";
+  srcs = [
+    ./prelude.lisp
+  ];
+}