Add documentation on how to run the performance suite.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5951 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/NEWS b/NEWS
index 4c57553..b87a9a4 100644
--- a/NEWS
+++ b/NEWS
@@ -83,7 +83,7 @@
   have been fixed.
 
 - A simple performance evaluation suite has been added.  See
-  perf/README for details.  "make perf" runs the tests.  There are
+  perf/README and README_DEVELOPERS for details.  There are
   various bells and whistles.
 
 - New configuration flags: