small refinement in the outer/inner doc

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15206

diff --git a/README_DEVELOPERS b/README_DEVELOPERS
index 997f495742fece531933eb78bd1d36e42dccdba0..fdd70b507eddf77312b1cdb06d6ac1f3a1e351b1 100644 (file)
--- a/README_DEVELOPERS
+++ b/README_DEVELOPERS
@@ -250,6 +250,7 @@ Do *not* use vg-in-place.
 
  To compare the performance of multiple Valgrind versions, do :
     perl perf/vg_perf --outer-valgrind=../outer/.../bin/valgrind \
+      --outer-tool=callgrind \
       --vg=../inner_xxxx --vg=../inner_yyyy perf
   (where inner_xxxx and inner_yyyy are the toplevel directories of
   the versions to compare).