diff --git a/pyproject.toml b/pyproject.toml
index 13af449..05954fc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,3 +2,7 @@
 name = "gears" # REQUIRED, is the only field that cannot be marked as dynamic.
 
 version = "0.0.0"
+
+# TODO: specify optional dependency frozen libraries with .update
+# look into dataclasses.replace
+# TODO: specify test-dependency for pytest
diff --git a/tests/test_signals.py b/tests/test_signals.py
index 76ac6aa..5b7af55 100644
--- a/tests/test_signals.py
+++ b/tests/test_signals.py
@@ -75,6 +75,7 @@ def test_connect_property():
         foo,
         lambda foo: foo.bar,
         lambda foo, bar: Foo(bar=bar, baz=foo.baz),
+        # TODO: look into dataclasses.replace
     )
 
     assert bar() == 1