transparent conversion of dense and sparse Eigen types
diff --git a/setup.py b/setup.py
index 7562860..4c6e156 100644
--- a/setup.py
+++ b/setup.py
@@ -20,6 +20,7 @@
         'include/pybind11/cast.h',
         'include/pybind11/complex.h',
         'include/pybind11/descr.h',
+        'include/pybind11/eigen.h',
         'include/pybind11/numpy.h',
         'include/pybind11/pybind11.h',
         'include/pybind11/stl.h',