diff --git a/README.md b/README.md
index 8acd3ab..fdafe2f 100644
--- a/README.md
+++ b/README.md
@@ -22,3 +22,24 @@ is included in the `LICENSE` file in this distribution.
 ## Documentation
 
 Documentations can be found at [https://hexdocs.pm/vivid_png](https://hexdocs.pm/vivid_png).
+
+## Status
+
+```elixir
+use Vivid
+alias Vivid.PNG
+
+frame  = Frame.init(300,200)
+text   = Font.line("seems to work")
+         |> Transform.fill(frame)
+         |> Transform.center(frame)
+         |> Transform.apply
+circle = Circle.init(Point.init(100, 100), 50)
+box    = Box.init(Point.init(250,150), Point.init(275, 175))
+
+frame
+|> Frame.push(text,   RGBA.black)
+|> Frame.push(circle, RGBA.init(1,0,0,0.5))
+|> Frame.push(box,    RGBA.init(0,0,1, 0.75))
+|> PNG.to_png("example.png")
+```
\ No newline at end of file
diff --git a/example.png b/example.png
new file mode 100644
index 0000000..3625ee8
Binary files /dev/null and b/example.png differ
diff --git a/lib/vivid/png/buffer.ex b/lib/vivid/png/buffer.ex
index c115447..aabcef4 100644
--- a/lib/vivid/png/buffer.ex
+++ b/lib/vivid/png/buffer.ex
@@ -1,7 +1,14 @@
 defimpl Vivid.PNG, for: Vivid.Buffer do
-  alias Vivid.PNG.Palette
   alias Vivid.{Buffer, RGBA}
 
+  @moduledoc """
+  Convert a Vivid buffer to a PNG file.
+  """
+
+  @doc """
+  Convert a Vivid buffer into a PNG file.
+  """
+  @spec to_png(Buffer.t, Path.t) :: :ok | {:error, any}
   def to_png(buffer, path) do
     with {:ok, file} <- File.open(path, [:write]),
          png         <- create_png(buffer, file),
diff --git a/lib/vivid/png/frame.ex b/lib/vivid/png/frame.ex
index 6fed81d..b1a00b4 100644
--- a/lib/vivid/png/frame.ex
+++ b/lib/vivid/png/frame.ex
@@ -1,6 +1,14 @@
 defimpl Vivid.PNG, for: Vivid.Frame do
   alias Vivid.{PNG, Frame}
 
+  @moduledoc """
+  Convert a Vivid frame into a PNG file.
+  """
+
+  @doc """
+  Convert a Vivid frame into a PNG file.
+  """
+  @spec to_png(Frame.t, Path.t) :: :ok | {:error, any}
   def to_png(frame, file) do
     frame
     |> Frame.buffer(:horizontal)
diff --git a/lib/vivid/png/shape.ex b/lib/vivid/png/shape.ex
index d1c6296..5be1eed 100644
--- a/lib/vivid/png/shape.ex
+++ b/lib/vivid/png/shape.ex
@@ -1,7 +1,10 @@
 defmodule Vivid.PNG.ShapeToPng do
-  use Vivid
-  alias Vivid.PNG
+  alias Vivid.{PNG, Shape, Bounds, Transform, Frame}
 
+  @moduledoc false
+
+  @doc false
+  @spec to_png(Shape.t, Path.t) :: :ok | {:error, any}
   def to_png(shape, file) do
     bounds = Bounds.bounds(shape)
     width  = bounds |> Bounds.width  |> round |> Kernel.+(3)
diff --git a/lib/vivid_png.ex b/lib/vivid_png.ex
index 20f4445..45fde85 100644
--- a/lib/vivid_png.ex
+++ b/lib/vivid_png.ex
@@ -1,5 +1,5 @@
 defprotocol Vivid.PNG do
-  alias Vivid.Shape
+  alias Vivid.{Shape, Frame, Buffer}
   @moduledoc """
   Turn a Vivid frame or shape into a PNG
   """
@@ -7,6 +7,6 @@ defprotocol Vivid.PNG do
   @doc """
   Turn a frame or shape into a PNG file.
   """
-  @spec to_png(Shape.t, Path.t) :: :ok | {:error, any}
+  @spec to_png(Shape.t | Frame.t | Buffer.t, Path.t) :: :ok | {:error, any}
   def to_png(shape, file)
 end
diff --git a/mix.exs b/mix.exs
index 69b2ff9..df08fbb 100644
--- a/mix.exs
+++ b/mix.exs
@@ -12,12 +12,8 @@ defmodule Vivid.PNG.Mixfile do
      deps: deps()]
   end
 
-  # Configuration for the OTP application
-  #
-  # Type "mix help compile.app" for more information
   def application do
-    # Specify extra applications you'll use from Erlang/Elixir
-    [extra_applications: [:logger, :png]]
+    [applications: [:logger, :png]]
   end
 
   def description do
@@ -28,7 +24,7 @@ defmodule Vivid.PNG.Mixfile do
 
   def package do
     [
-      maintainers: [ "James Harton <james@messagerocket.co>" ],
+      maintainers: [ "James Harton <james@automat.nz>" ],
       licenses: [ "MIT" ],
       links: %{
         "Source" => "https://github.com/jamesotron/vivid_png.ex"
@@ -36,15 +32,6 @@ defmodule Vivid.PNG.Mixfile do
     ]
   end
 
-  # Dependencies can be Hex packages:
-  #
-  #   {:my_dep, "~> 0.3.0"}
-  #
-  # Or git/path repositories:
-  #
-  #   {:my_dep, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
-  #
-  # Type "mix help deps" for more examples and options
   defp deps do
     [
       {:ex_doc, ">= 0.0.0", only: :dev},