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diff --git a/NEWS b/NEWS
index b96cea7c..9eae6480 100644
--- a/NEWS
+++ b/NEWS
@@ -40,6 +40,8 @@ Changes from 5.1.0 to 5.1.1
 9. Several example programs in the manual have been updated to their
    modern POSIX equivalents.
 
+10. Handling of Infinity and NaN values has been improved.
+
 xx. There have been numerous minor code cleanups and bug fixes. See the
     ChangeLog for details.