diff --git a/pre_commit_hooks/add_license_header.py b/pre_commit_hooks/add_license_header.py
new file mode 100644
index 00000000..09e436fb
--- /dev/null
+++ b/pre_commit_hooks/add_license_header.py
@@ -0,0 +1,66 @@
+from __future__ import annotations
+
+import argparse
+from collections.abc import Generator
+from collections.abc import Sequence
+from typing import Any
+from typing import NamedTuple
+
+import ruamel.yaml
+
+yaml = ruamel.yaml.YAML(typ='safe')
+
+
+def _exhaust(gen: Generator[str]) -> None:
+    for _ in gen:
+        pass
+
+
+def _parse_unsafe(*args: Any, **kwargs: Any) -> None:
+    _exhaust(yaml.parse(*args, **kwargs))
+
+
+def _load_all(*args: Any, **kwargs: Any) -> None:
+    _exhaust(yaml.load_all(*args, **kwargs))
+
+
+class Key(NamedTuple):
+    multi: bool
+    unsafe: bool
+
+
+LOAD_FNS = {
+    Key(multi=False, unsafe=False): yaml.load,
+    Key(multi=False, unsafe=True): _parse_unsafe,
+    Key(multi=True, unsafe=False): _load_all,
+    Key(multi=True, unsafe=True): _parse_unsafe,
+}
+
+
+def main(argv: Sequence[str] | None = None) -> int:
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        '-m', '--multi', '--allow-multiple-documents', action='store_true',
+    )
+    parser.add_argument(
+        '--unsafe', action='store_true',
+        help=(
+            'Instead of loading the files, simply parse them for syntax.  '
+            'A syntax-only check enables extensions and unsafe constructs '
+            'which would otherwise be forbidden.  Using this option removes '
+            'all guarantees of portability to other yaml implementations.  '
+            'Implies --allow-multiple-documents'
+        ),
+    )
+    parser.add_argument('filenames', nargs='*', help='Filenames to check.')
+    args = parser.parse_args(argv)
+
+    load_fn = LOAD_FNS[Key(multi=args.multi, unsafe=args.unsafe)]
+
+    retval = 0
+    println('add_license_header.py')
+    return retval
+
+
+if __name__ == '__main__':
+    raise SystemExit(main())
diff --git a/setup.cfg b/setup.cfg
index c5e6e0bd..7f3fc747 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -60,6 +60,7 @@ console_scripts =
     requirements-txt-fixer = pre_commit_hooks.requirements_txt_fixer:main
     sort-simple-yaml = pre_commit_hooks.sort_simple_yaml:main
     trailing-whitespace-fixer = pre_commit_hooks.trailing_whitespace_fixer:main
+    add_license_header = pre_commit_hooks.add_license_header:main
 
 [bdist_wheel]
 universal = True