diff --git a/comment_spell_check.py b/comment_spell_check.py
index d8c7a11..1c9c25f 100755
--- a/comment_spell_check.py
+++ b/comment_spell_check.py
@@ -1,5 +1,23 @@
 #!/usr/bin/env python3
 
+# ==========================================================================
+#
+#   Copyright NumFOCUS
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#          http://www.apache.org/licenses/LICENSE-2.0.txt
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# ==========================================================================*/
+
 import sys
 import os
 import fnmatch
diff --git a/pyproject.toml b/pyproject.toml
index 13f8211..308a147 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,10 +9,11 @@ authors = [
 ]
 description = "A script to automatically spell checks comments of a codebase."
 readme = "README.md"
+license = {file = "LICENSE"}
 requires-python = ">=3.8"
 classifiers = [
     "Programming Language :: Python :: 3",
-    "License :: OSI Approved :: MIT License",
+    "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent",
 ]
 dynamic = ["dependencies", "version"]
diff --git a/tests/test_comment_spell_check.py b/tests/test_comment_spell_check.py
index f22b3bf..63f396a 100644
--- a/tests/test_comment_spell_check.py
+++ b/tests/test_comment_spell_check.py
@@ -1,3 +1,21 @@
+# ==========================================================================
+#
+#   Copyright NumFOCUS
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#          http://www.apache.org/licenses/LICENSE-2.0.txt
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# ==========================================================================*/
+
 import unittest
 import subprocess
 
diff --git a/utils/itk_crawl.py b/utils/itk_crawl.py
index a59b1e4..acbe13f 100755
--- a/utils/itk_crawl.py
+++ b/utils/itk_crawl.py
@@ -1,5 +1,23 @@
 #! /usr/bin/env python
 
+# ==========================================================================
+#
+#   Copyright NumFOCUS
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#          http://www.apache.org/licenses/LICENSE-2.0.txt
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# ==========================================================================*/
+
 import itk
 
 wrds = dir(itk)
diff --git a/utils/myspell.py b/utils/myspell.py
index 41e752e..ed28440 100755
--- a/utils/myspell.py
+++ b/utils/myspell.py
@@ -1,5 +1,23 @@
 #! /usr/bin/env python
 
+# ==========================================================================
+#
+#   Copyright NumFOCUS
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#          http://www.apache.org/licenses/LICENSE-2.0.txt
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# ==========================================================================*/
+
 import sys
 from enchant.checker import SpellChecker
 from enchant.tokenize import EmailFilter, URLFilter
diff --git a/utils/sitk_crawl.py b/utils/sitk_crawl.py
index bd2cd5f..1449e5c 100755
--- a/utils/sitk_crawl.py
+++ b/utils/sitk_crawl.py
@@ -1,5 +1,23 @@
 #! /usr/bin/env python
 
+# ==========================================================================
+#
+#   Copyright NumFOCUS
+#
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#          http://www.apache.org/licenses/LICENSE-2.0.txt
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+#
+# ==========================================================================*/
+
 import SimpleITK as sitk
 
 wrds = dir(sitk)