NEWS: Update

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15688 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/NEWS b/NEWS
index a8cd14d..14a0bac 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,9 @@
 
 * Callgrind:
 
+* DRD:
+n-i-bz Improved thread startup time significantly on non-Linux platforms.
+
 * ==================== OTHER CHANGES ====================
 
 * ==================== FIXED BUGS ====================