diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..111890d
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1 @@
+include ext_src/*
diff --git a/setup.py b/setup.py
index c5736d1..ae7f560 100644
--- a/setup.py
+++ b/setup.py
@@ -4,12 +4,13 @@ from Cython.Build import cythonize
 extensions = [
     Extension(
         "sphereproj._project",
-        [
-            "ext_src/_project.pyx",
+        sources=[
+            "ext_src/_project.pyx", "ext_src/_project.cpp"
         ],
+        include_dirs=["ext_src"],
         language="c++"
     )
 ]
 
 
-setup(py_modules=["sphereproj"],ext_modules=cythonize(extensions))
+setup(ext_modules=cythonize(extensions))
diff --git a/src/sphereproj/__init__.py b/src/sphereproj/__init__.py
new file mode 100644
index 0000000..38ac804
--- /dev/null
+++ b/src/sphereproj/__init__.py
@@ -0,0 +1 @@
+from ._project import spherical_projection
\ No newline at end of file