diff --git a/pytools/__init__.pyi b/pytools/__init__.pyi
new file mode 100644
index 0000000000000000000000000000000000000000..f2961ac3b9537830c0d9c2053ede6e5ff4cf8ddb
--- /dev/null
+++ b/pytools/__init__.pyi
@@ -0,0 +1,20 @@
+from typing import Any, Iterable, Optional, Set, TypeVar
+from numbers import Number
+
+T = TypeVar("T")
+
+def one(iterable: Iterable[T]) -> T: ...
+def is_single_valued(iterable: Iterable[T], equality_pred: Callable[[T, T], bool] = ...) -> bool: ...
+all_equal = is_single_valued
+def all_roughly_equal(iterable: Iterable[Number], threshold: Number) -> bool: ...
+def single_valued(iterable: Iterable[T], equality_pred: Callable[[T, T], bool] = ...) -> T: ...
+
+def memoize(*args: T, **kwargs: Any) -> T: ...
+def memoize_method(method: T) -> T: ...
+
+class UniqueNameGenerator:
+    def __init__(self, existing_names: Optional[Set[str]] = ..., forced_prefix: str = ...) -> None: ...
+    def __call__(self, based_on: str = ...) -> str: ...
+    def is_name_conflicting(self, name: str) -> bool: ...
+    def add_name(self, name: str) -> bool: ...
+    def add_names(self, name: Iterable[str]) -> bool: ...
diff --git a/pytools/py.typed b/pytools/py.typed
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/setup.py b/setup.py
index adba753c7690f5c7a258d324d3799a0aa98618ca..1023096c4b06900bc95fdb04143070c85d29e1ac 100644
--- a/setup.py
+++ b/setup.py
@@ -48,6 +48,8 @@ setup(name="pytools",
           "numpy>=1.6.0",
           ],
 
+      package_data={"pytools": ["py.typed", "__init__.pyi"]},
+
       author="Andreas Kloeckner",
       url="http://pypi.python.org/pypi/pytools",
       author_email="inform@tiker.net",