diff --git a/lenskit/lenskit/data/__init__.py b/lenskit/lenskit/data/__init__.py
index 3dc3343d4..ecea5252b 100644
--- a/lenskit/lenskit/data/__init__.py
+++ b/lenskit/lenskit/data/__init__.py
@@ -3,6 +3,7 @@
 # Copyright (C) 2023-2024 Drexel University
 # Licensed under the MIT license, see LICENSE.md for details.
 # SPDX-License-Identifier: MIT
+
 from __future__ import annotations
 
 from typing_extensions import Literal, TypeAlias
diff --git a/lenskit/lenskit/pipeline/state.py b/lenskit/lenskit/pipeline/state.py
index 10433fe12..f92e98ebb 100644
--- a/lenskit/lenskit/pipeline/state.py
+++ b/lenskit/lenskit/pipeline/state.py
@@ -1,3 +1,9 @@
+# This file is part of LensKit.
+# Copyright (C) 2018-2023 Boise State University
+# Copyright (C) 2023-2024 Drexel University
+# Licensed under the MIT license, see LICENSE.md for details.
+# SPDX-License-Identifier: MIT
+
 # pyright: strict
 from collections.abc import Mapping
 from typing import Any, Iterator
diff --git a/lenskit/lenskit/splitting/records.py b/lenskit/lenskit/splitting/records.py
index 63fa8881a..0a7c69de7 100644
--- a/lenskit/lenskit/splitting/records.py
+++ b/lenskit/lenskit/splitting/records.py
@@ -3,6 +3,7 @@
 # Copyright (C) 2023-2024 Drexel University
 # Licensed under the MIT license, see LICENSE.md for details.
 # SPDX-License-Identifier: MIT
+
 from __future__ import annotations
 
 import logging
diff --git a/lenskit/lenskit/types.py b/lenskit/lenskit/types.py
index bcaecdadb..49a8202e5 100644
--- a/lenskit/lenskit/types.py
+++ b/lenskit/lenskit/types.py
@@ -1,3 +1,9 @@
+# This file is part of LensKit.
+# Copyright (C) 2018-2023 Boise State University
+# Copyright (C) 2023-2024 Drexel University
+# Licensed under the MIT license, see LICENSE.md for details.
+# SPDX-License-Identifier: MIT
+
 # pyright: strict
 from __future__ import annotations
 
diff --git a/lenskit/tests/test_pipeline_state.py b/lenskit/tests/test_pipeline_state.py
index c9fe6b8f5..4ed5a14e2 100644
--- a/lenskit/tests/test_pipeline_state.py
+++ b/lenskit/tests/test_pipeline_state.py
@@ -1,3 +1,9 @@
+# This file is part of LensKit.
+# Copyright (C) 2018-2023 Boise State University
+# Copyright (C) 2023-2024 Drexel University
+# Licensed under the MIT license, see LICENSE.md for details.
+# SPDX-License-Identifier: MIT
+
 from pytest import raises
 
 from lenskit.pipeline import PipelineState