Add whatsnew entry

miker985 · miker985 · commit 58a7c68aa753 · 2018-07-06T10:07:24.000-07:00
diff --git a/doc/source/whatsnew/v0.24.0.txt b/doc/source/whatsnew/v0.24.0.txt
@@ -288,9 +288,7 @@ Bug Fixes
 Categorical
 ^^^^^^^^^^^
 
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+- Bug in :meth:`Categorical.from_codes` where `NaN` values in `codes` were silently converted to `0` (:issue:`21767`)
 
 Datetimelike
 ^^^^^^^^^^^^
