diff --git a/dev-python/cffi/cffi-1.2.1.ebuild b/dev-python/cffi/cffi-1.2.1.ebuild
index c39d04a1eef47..8d5fda8bff688 100644
--- a/dev-python/cffi/cffi-1.2.1.ebuild
+++ b/dev-python/cffi/cffi-1.2.1.ebuild
@@ -4,6 +4,8 @@
 
 EAPI="5"
 
+# DO NOT ADD pypy to PYTHON_COMPAT
+# pypy bundles a modified version of cffi. Use python_gen_cond_dep instead.
 PYTHON_COMPAT=( python{2_7,3_3,3_4} )
 
 inherit distutils-r1