diff --git a/PFERD/organizer.py b/PFERD/organizer.py
index c624d23..e5b2c10 100644
--- a/PFERD/organizer.py
+++ b/PFERD/organizer.py
@@ -15,6 +15,8 @@ from .utils import PrettyLogger, prompt_yes_no
 LOGGER = logging.getLogger(__name__)
 PRETTY = PrettyLogger(LOGGER)
 
+# TODO prevent overwriting an already marked file
+
 
 class FileAcceptException(Exception):
     """An exception while accepting a file."""
diff --git a/PFERD/pferd.py b/PFERD/pferd.py
index 259e961..c8b6701 100644
--- a/PFERD/pferd.py
+++ b/PFERD/pferd.py
@@ -13,7 +13,7 @@ from .ilias import (IliasAuthenticator, IliasCrawler, IliasDirectoryFilter,
 from .location import Location
 from .organizer import Organizer
 from .tmp_dir import TmpDir
-from .transform import Transform, Transformable, apply_transform
+from .transform import TF, Transform, apply_transform
 from .utils import PrettyLogger
 
 # TODO save known-good cookies as soon as possible
@@ -41,7 +41,8 @@ class Pferd(Location):
         self._tmp_dir = TmpDir(self.resolve(tmp_dir))
         self._test_run = test_run
 
-    def _print_transformables(self, transformables: List[Transformable]) -> None:
+    @staticmethod
+    def _print_transformables(transformables: List[TF]) -> None:
         LOGGER.info("")
         LOGGER.info("Results of the test run:")
         for transformable in transformables: