diff --git a/joy/vui/core.py b/joy/vui/core.py
index 0501b30..6ed210b 100644
--- a/joy/vui/core.py
+++ b/joy/vui/core.py
@@ -1,3 +1,22 @@
+# -*- coding: utf-8 -*-
+#
+#    Copyright © 2019 Simon Forman
+#
+#    This file is part of Thun
+#
+#    Thun is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    Thun is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with Thun.  If not see <http://www.gnu.org/licenses/>.
+#
 from sys import stderr
 from traceback import format_exc
 import pygame
diff --git a/joy/vui/default_joy_home/library.py b/joy/vui/default_joy_home/library.py
index 921acce..7f0cabb 100644
--- a/joy/vui/default_joy_home/library.py
+++ b/joy/vui/default_joy_home/library.py
@@ -16,7 +16,7 @@ from joy.library import (
     SimpleFunctionWrapper,
     )
 from joy.utils.stack import list_to_stack, concat
-from vui import core, text_viewer, stack_viewer
+from joy.vui import core, text_viewer, stack_viewer
 
 
 def install(command): D[command.name] = command
diff --git a/joy/vui/display.py b/joy/vui/display.py
index 20b044d..81f69a6 100644
--- a/joy/vui/display.py
+++ b/joy/vui/display.py
@@ -1,21 +1,21 @@
 # -*- coding: utf-8 -*-
 #
-#    Copyright © 2018 Simon Forman
+#    Copyright © 2019 Simon Forman
 #
-#    This file is part of joy.py
+#    This file is part of Thun
 #
-#    joy.py is free software: you can redistribute it and/or modify
+#    Thun is free software: you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
 #    the Free Software Foundation, either version 3 of the License, or
 #    (at your option) any later version.
 #
-#    joy.py is distributed in the hope that it will be useful,
+#    Thun is distributed in the hope that it will be useful,
 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 #    GNU General Public License for more details.
 #
 #    You should have received a copy of the GNU General Public License
-#    along with joy.py.  If not see <http://www.gnu.org/licenses/>.
+#    along with Thun.  If not see <http://www.gnu.org/licenses/>.
 #
 '''
 This module implements a simple visual display system modeled on Oberon.
@@ -29,13 +29,13 @@ from copy import copy
 from sys import stderr
 from traceback import format_exc
 import pygame
-from core import (
+from .core import (
     open_viewer_on_string,
     GREY,
     MOUSE_EVENTS,
     )
-from viewer import Viewer
-import text_viewer
+from .viewer import Viewer
+from joy.vui import text_viewer
 
 
 class Display(object):
diff --git a/joy/vui/main.py b/joy/vui/main.py
index 7557fc6..f1e14cb 100644
--- a/joy/vui/main.py
+++ b/joy/vui/main.py
@@ -1,8 +1,26 @@
-#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+#    Copyright © 2019 Simon Forman
+#
+#    This file is part of Thun
+#
+#    Thun is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    Thun is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with Thun.  If not see <http://www.gnu.org/licenses/>.
+#
 import os, sys, traceback
 import pygame
 from joy.library import initialize, DefinitionWrapper, SimpleFunctionWrapper
-import core, display, persist_task
+from joy.vui import core, display, persist_task
 
 
 FULLSCREEN = '-f' in sys.argv
@@ -107,7 +125,3 @@ def main(screen, clock, pt):
         sys.stdout = old_stdout
 
     return name_space['d']
-
-
-if __name__ == '__main__':
-    main(*init())
diff --git a/joy/vui/persist_task.py b/joy/vui/persist_task.py
index ab3520f..84af526 100644
--- a/joy/vui/persist_task.py
+++ b/joy/vui/persist_task.py
@@ -1,8 +1,27 @@
+# -*- coding: utf-8 -*-
+#
+#    Copyright © 2019 Simon Forman
+#
+#    This file is part of Thun
+#
+#    Thun is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    Thun is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with Thun.  If not see <http://www.gnu.org/licenses/>.
+#
 import os, pickle, traceback
 from collections import Counter
 from dulwich.errors import NotGitRepository
 from dulwich.repo import Repo
-import core, init_joy_home
+from joy.vui import core, init_joy_home
 
 
 def open_repo(repo_dir=None, initialize=False):
diff --git a/joy/vui/stack_viewer.py b/joy/vui/stack_viewer.py
index 74050ef..e03fcf6 100644
--- a/joy/vui/stack_viewer.py
+++ b/joy/vui/stack_viewer.py
@@ -1,5 +1,24 @@
+# -*- coding: utf-8 -*-
+#
+#    Copyright © 2019 Simon Forman
+#
+#    This file is part of Thun
+#
+#    Thun is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    Thun is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with Thun.  If not see <http://www.gnu.org/licenses/>.
+#
 from joy.utils.stack import expression_to_string, iter_stack
-import core, text_viewer
+from joy.vui import core, text_viewer
 
 
 MAX_WIDTH = 64
diff --git a/joy/vui/text_viewer.py b/joy/vui/text_viewer.py
index 451c363..1ffea26 100644
--- a/joy/vui/text_viewer.py
+++ b/joy/vui/text_viewer.py
@@ -1,7 +1,26 @@
+# -*- coding: utf-8 -*-
+#
+#    Copyright © 2019 Simon Forman
+#
+#    This file is part of Thun
+#
+#    Thun is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    Thun is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with Thun.  If not see <http://www.gnu.org/licenses/>.
+#
 import string
 import pygame
 from joy.utils.stack import expression_to_string
-from core import (
+from joy.vui.core import (
     ARROW_KEYS,
     BACKGROUND as BG,
     FOREGROUND as FG,
@@ -11,8 +30,8 @@ from core import (
     SUCCESS,
     push,
     )
-import viewer, font_data
-reload(viewer)
+from joy.vui import viewer, font_data
+#reload(viewer)
 
 
 MenuViewer = viewer.MenuViewer
diff --git a/joy/vui/viewer.py b/joy/vui/viewer.py
index 9b56467..e15d652 100644
--- a/joy/vui/viewer.py
+++ b/joy/vui/viewer.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-#    Copyright © 2018 Simon Forman
+#    Copyright © 2019 Simon Forman
 #
 #    This file is part of joy.py
 #
@@ -18,7 +18,7 @@
 #    along with joy.py.  If not see <http://www.gnu.org/licenses/>.
 #
 import pygame
-from core import BACKGROUND, FOREGROUND
+from joy.vui.core import BACKGROUND, FOREGROUND
 
 
 class Viewer(object):
diff --git a/setup.py b/setup.py
index 4ca08b1..c0e58fd 100755
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@ setup(
   author_email='forman.simon@gmail.com',
   url='https://joypy.osdn.io',
   license='GPLv3+',
-  packages=['joy', 'joy.utils', 'joy.gui'],
+  packages=['joy', 'joy.utils', 'joy.gui', 'joy.vui'],
   classifiers=[
     'Development Status :: 4 - Beta',
     'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',