diff --git a/CHANGES.rst b/CHANGES.rst
index 923e515c3..26339670b 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,6 +5,9 @@ Changelog (Pillow)
 5.3.0 (unreleased)
 ------------------
 
+- CI: Install CFFI and pycparser without any PYTHONOPTIMIZE #3374
+  [hugovk]
+
 - Read/Save RGB webp as RGB (instead of RGBX) #3298
   [kkopachev]