diff --git a/ereg/__init__.py b/ereg/__init__.py
index 28fe317..730fe4b 100644
--- a/ereg/__init__.py
+++ b/ereg/__init__.py
@@ -1,4 +1,4 @@
 # TODO do we need this?
-from .functional import registration_function
+from .functional import registration_function, resample_function
 from .registration import RegistrationClass
 from .utils.io import read_image_and_cast_to_32bit_float