diff --git a/README.rst b/README.rst
index 4945af399f65d637153f20c477ed4f46ac7e0792..886f9888eebf36774ca38573488d39e194932809 100644
--- a/README.rst
+++ b/README.rst
@@ -23,3 +23,6 @@ TODO
 - License.
 - Changelog.
 - Documentation.
+- Replace the GCC preprocessor for generating :code:`unshare/constants.py`
+  with a Python one (`CPIP <http://cpip.sourceforge.net/>`_ or `pycparser
+  <https://github.com/eliben/pycparser>`_).