Add a changelog note

zopefoundation · Sep 13, 2022 · 755b2a7 · 755b2a7
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 5.2.1 (unreleased)
 ==================
 
-- Nothing changed yet.
+- Disable unsafe math optimizations in C code.  See `pull request 40
+  <https://github.com/zopefoundation/zope.index/pull/40>`_.
 
 
 5.2.0 (2022-04-06)