Announce in NEWS the optimisation done for helgrind big applications
full history level



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15129 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/NEWS b/NEWS
index 02c7783..d5058b7 100644
--- a/NEWS
+++ b/NEWS
@@ -16,6 +16,8 @@
   taken so far.
 
 * Helgrind:
+  Memory and speed improvement for --history-level=full for big applications
+  accessing a lot of memory with many different stacktraces.
 
 * Callgrind: