--- a/NEWS
+++ b/NEWS
@@ -10,6 +10,8 @@
   "logdensity.foo". The first argument of the log density function is
   the value at which the density is to be evaluated, and the remaining
   arguments are the parameters of the distribution.
+* The sum and prod functions are now variadic, like their R equivalents
+  and return respectively the sum and product over all arguments.
 Bug fixes