diff --git a/.gitignore b/.gitignore
index 36cb4ec..2b63ed9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@
 /.purs*
 /.psa*
 .DS_Store
+/.spago
diff --git a/packages.dhall b/packages.dhall
new file mode 100644
index 0000000..5cf6da3
--- /dev/null
+++ b/packages.dhall
@@ -0,0 +1,121 @@
+{-
+Welcome to your new Dhall package-set!
+
+Below are instructions for how to edit this file for most use
+cases, so that you don't need to know Dhall to use it.
+
+## Warning: Don't Move This Top-Level Comment!
+
+Due to how `dhall format` currently works, this comment's
+instructions cannot appear near corresponding sections below
+because `dhall format` will delete the comment. However,
+it will not delete a top-level comment like this one.
+
+## Use Cases
+
+Most will want to do one or both of these options:
+1. Override/Patch a package's dependency
+2. Add a package not already in the default package set
+
+This file will continue to work whether you use one or both options.
+Instructions for each option are explained below.
+
+### Overriding/Patching a package
+
+Purpose:
+- Change a package's dependency to a newer/older release than the
+    default package set's release
+- Use your own modified version of some dependency that may
+    include new API, changed API, removed API by
+    using your custom git repo of the library rather than
+    the package set's repo
+
+Syntax:
+Replace the overrides' "{=}" (an empty record) with the following idea
+The "//" or "⫽" means "merge these two records and
+  when they have the same value, use the one on the right:"
+-------------------------------
+let override =
+  { packageName =
+      upstream.packageName // { updateEntity1 = "new value", updateEntity2 = "new value" }
+  , packageName =
+      upstream.packageName // { version = "v4.0.0" }
+  , packageName =
+      upstream.packageName // { repo = "https://www.example.com/path/to/new/repo.git" }
+  }
+-------------------------------
+
+Example:
+-------------------------------
+let overrides =
+  { halogen =
+      upstream.halogen // { version = "master" }
+  , halogen-vdom =
+      upstream.halogen-vdom // { version = "v4.0.0" }
+  }
+-------------------------------
+
+### Additions
+
+Purpose:
+- Add packages that aren't already included in the default package set
+
+Syntax:
+Replace the additions' "{=}" (an empty record) with the following idea:
+-------------------------------
+let additions =
+  { "package-name" =
+       mkPackage
+         [ "dependency1"
+         , "dependency2"
+         ]
+         "https://example.com/path/to/git/repo.git"
+         "tag ('v4.0.0') or branch ('master')"
+  , "package-name" =
+       mkPackage
+         [ "dependency1"
+         , "dependency2"
+         ]
+         "https://example.com/path/to/git/repo.git"
+         "tag ('v4.0.0') or branch ('master')"
+  , etc.
+  }
+-------------------------------
+
+Example:
+-------------------------------
+let additions =
+  { benchotron =
+      mkPackage
+        [ "arrays"
+        , "exists"
+        , "profunctor"
+        , "strings"
+        , "quickcheck"
+        , "lcg"
+        , "transformers"
+        , "foldable-traversable"
+        , "exceptions"
+        , "node-fs"
+        , "node-buffer"
+        , "node-readline"
+        , "datetime"
+        , "now"
+        ]
+        "https://github.com/hdgarrood/purescript-benchotron.git"
+        "v7.0.0"
+  }
+-------------------------------
+-}
+
+let mkPackage =
+      https://raw.githubusercontent.com/purescript/package-sets/psc-0.12.3-20190315/src/mkPackage.dhall sha256:0b197efa1d397ace6eb46b243ff2d73a3da5638d8d0ac8473e8e4a8fc528cf57
+
+let upstream =
+      https://raw.githubusercontent.com/purescript/package-sets/psc-0.12.3-20190315/src/packages.dhall sha256:08714bc666b16834f0f4cf86d408745ce005c43e3343821e4c3864ef28709177
+
+let overrides = {=}
+
+let additions = {=}
+
+in  upstream // overrides // additions
diff --git a/spago.dhall b/spago.dhall
new file mode 100644
index 0000000..d1a1abd
--- /dev/null
+++ b/spago.dhall
@@ -0,0 +1,16 @@
+{-
+Welcome to a Spago project!
+You can edit this file as you like.
+-}
+{ name =
+    "my-project"
+, dependencies =
+    [ "prelude"
+    , "console"
+    , "lists"
+    , "free"
+    , "spec"
+    ]
+, packages =
+    ./packages.dhall
+}