diff --git a/Misc/NEWS b/Misc/NEWS
index 917b7cd..672d918 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -21,6 +21,10 @@
 Library
 -------
 
+- Issue #9920: Skip tests for cmath.atan and cmath.atanh applied to
+  complex zeros on systems where the log1p function fails to respect
+  the sign of zero.  This fixes a test failure on AIX.
+
 - Issue #10446: Module documentation generated by pydoc now links to a
   version-specific online reference manual.