Add whatsnew entry

miker985 · miker985 · commit acb00dbd2984 · 2018-07-30T07:55:46.000-07:00
diff --git a/doc/source/whatsnew/v0.24.0.txt b/doc/source/whatsnew/v0.24.0.txt
@@ -486,9 +486,7 @@ 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
 ^^^^^^^^^^^^
