diff --git a/MANIFEST.in b/MANIFEST.in
index 0d1f464c..a48edae7 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,8 @@
 include README.rst
 include LICENSE
+include skyfield/py.typed
 include skyfield/data/*.gz
 include skyfield/data/*.npy
 include skyfield/data/*.npz
 include skyfield/tests/data/*
+global-include *.pyi
diff --git a/setup.py b/setup.py
index e001a8a2..63ae5b50 100644
--- a/setup.py
+++ b/setup.py
@@ -33,6 +33,7 @@
         'skyfield.tests',
     ],
     package_data = {
+        'skyfield': ['py.typed', '*.pyi'],
         'skyfield.data': ['*.gz', '*.npy', '*.npz'],
         'skyfield.tests': ['data/*'],
     },
diff --git a/skyfield/naifcodes.pyi b/skyfield/naifcodes.pyi
new file mode 100644
index 00000000..7111a1db
--- /dev/null
+++ b/skyfield/naifcodes.pyi
@@ -0,0 +1,6 @@
+code_name_pairs: list[tuple[int, str]]
+code_names: dict[int, str]
+name_codes: dict[str, int]
+
+def numbered_name_of(code: int) -> str: ...
+def _target_name(target: str | int) -> str: ...
diff --git a/skyfield/py.typed b/skyfield/py.typed
new file mode 100644
index 00000000..e69de29b