diff --git a/vskernels/__init__.py b/vskernels/__init__.py
index 6b9d57d..8fd5695 100644
--- a/vskernels/__init__.py
+++ b/vskernels/__init__.py
@@ -12,7 +12,8 @@
 
 # flake8: noqa
 
-from . import exceptions, kernels, util
+from . import exceptions, kernels, types, util
 from .exceptions import *
 from .kernels import *
+from .types import *
 from .util import *
diff --git a/vskernels/helpers.py b/vskernels/helpers.py
index 75e33e8..fab1c58 100644
--- a/vskernels/helpers.py
+++ b/vskernels/helpers.py
@@ -41,6 +41,8 @@ def _get_prop(frame: vs.VideoFrame, key: str, t: Type[T]) -> T:
     """
     Get FrameProp ``prop`` from frame ``frame`` with expected type ``t`` to satisfy the type checker.
 
+    Taken from `lvsfunc`.
+
     :param frame:               Frame containing props.
     :param key:                 Prop to get.
     :param t:                   Type of prop.