   end
 
   @doc """
-  Determine the environment variable which would be set to override the path
+  Determine the environment variable which would be set to override the path.
   """
   @spec env_var(Nerves.Package.t) :: String.t
   def env_var(pkg) do

  to the NERVES_ARTIFACT_DIR or if undefined, `~/.nerves/artifacts`

  Packages which were obtained through other Mix SCM's such as path will
  have a base_dir local to the package path
  """
  @spec base_dir(Nerves.Package.t) :: String.t
  def base_dir(pkg) do

  @doc """
  Get the artifact name

  Requires the package and toolchain package to be supplied.
  """
  @spec name(Nerves.Package.t, Nerves.Package.t) :: String.t
  def name(pkg, toolchain) do
