Added math.isinf() and math.isnan()
diff --git a/Misc/NEWS b/Misc/NEWS
index 3e3f074..95845b6 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@
 Core and builtins
 -----------------
 
+- Issue #1640: Added math.isinf() and math.isnan() functions.
+
 - Issue #1726: Remove Python/atof.c from PCBuild/pythoncore.vcproj
 
 - Removed PCbuild8/ directory and added a new build directory for VS 2005