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diff --git a/README.md b/README.md
index e942ed3..4e69004 100644
--- a/README.md
+++ b/README.md
@@ -14,3 +14,7 @@ Contact
 -------
 
 [Mailing list](https://groups.google.com/forum/#!forum/python-cffi)
+
+To run tests under CPython, run:
+
+python setup.py build_ext -i