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diff --git a/NEWS b/NEWS
index 82e9ed5..3bb5cb3 100644
--- a/NEWS
+++ b/NEWS
@@ -26,6 +26,8 @@ Version 2.18
 
 * Added a benchmark framework to track performance of functions in glibc.
 
+* New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
+  It is based on draft TS 18661 and currently enabled as a GNU extension.
 
 Version 2.17