transparent conversion of dense and sparse Eigen types
diff --git a/docs/basics.rst b/docs/basics.rst
index cf39844..b1765c5 100644
--- a/docs/basics.rst
+++ b/docs/basics.rst
@@ -275,6 +275,10 @@
+---------------------------------+--------------------------+-------------------------------+
| ``std::function<...>`` | STL polymorphic function | :file:`pybind11/functional.h` |
+---------------------------------+--------------------------+-------------------------------+
+| ``Eigen::Matrix<...>`` | Dense Eigen matrices | :file:`pybind11/eigen.h` |
++---------------------------------+--------------------------+-------------------------------+
+| ``Eigen::SparseMatrix<...>`` | Sparse Eigen matrices | :file:`pybind11/eigen.h` |
++---------------------------------+--------------------------+-------------------------------+
.. [#f1] In practice, implementation and binding code will generally be located