diff --git a/python_appimage/__main__.py b/python_appimage/__main__.py
index 84b023e..7bac4ef 100644
--- a/python_appimage/__main__.py
+++ b/python_appimage/__main__.py
@@ -7,6 +7,11 @@ import sys
 __all__ = ['main']
 
 
+def directory(path):
+    if not os.path.isdir(path):
+        raise argparse.ArgumentTypeError("Not a directory: {}".format(path))
+    return os.path.abspath(path)
+
 def main():
     '''Entry point for the CLI
     '''
@@ -73,6 +78,8 @@ def main():
                                   help='force pip in-tree-build',
                                   action='store_true',
                                   default=False)
+    build_app_parser.add_argument('-x', '--extra-files', type=directory,
+        help='path to directory containing extra files to be baked in')
 
     list_parser = subparsers.add_parser('list',
         description='List Python versions installed in a manylinux image')
diff --git a/python_appimage/commands/build/app.py b/python_appimage/commands/build/app.py
index bef8bda..f18ed52 100644
--- a/python_appimage/commands/build/app.py
+++ b/python_appimage/commands/build/app.py
@@ -26,14 +26,14 @@ def _unpack_args(args):
     '''Unpack command line arguments
     '''
     return args.appdir, args.name, args.python_version, args.linux_tag,        \
-           args.python_tag, args.base_image, args.in_tree_build
+           args.python_tag, args.base_image, args.in_tree_build, args.extra_files
 
 
 _tag_pattern = re.compile('python([^-]+)[-]([^.]+)[.]AppImage')
 _linux_pattern = re.compile('manylinux([0-9]+)_' + platform.machine())
 
 def execute(appdir, name=None, python_version=None, linux_tag=None,
-            python_tag=None, base_image=None, in_tree_build=False):
+            python_tag=None, base_image=None, in_tree_build=False, extra_files=None):
     '''Build a Python application using a base AppImage
     '''
 
@@ -288,11 +288,9 @@ def execute(appdir, name=None, python_version=None, linux_tag=None,
                        exclude=(deprecation + git_warnings))
 
         # Bundle auxilliary application files
-        aux_files_path = glob.glob(appdir + '/files')
-        if aux_files_path:
-            aux_files_path = aux_files_path[0]
-            log('BUNDLE', os.path.basename(aux_files_path))
-            copy_tree(aux_files_path, 'AppDir/')
+        if extra_files is not None:
+            log('BUNDLE', os.path.basename(extra_files))
+            copy_tree(extra_files, 'AppDir/')
 
         # Bundle the entry point
         entrypoint_path = glob.glob(appdir + '/entrypoint.*')