diff --git a/README b/README
index 315f86d..91b8711 100644
--- a/README
+++ b/README
@@ -85,9 +85,9 @@
   5. Do "make install", possibly as root if the destination permissions
      require that.
 
-  6. See if it works.  Try "valgrind ls -l".  Either this works,
-     or it bombs out with some complaint.  In that case, please let
-     us know (see valgrind.kde.org/bugs.html).
+  6. See if it works.  Try "valgrind --tool-memcheck ls -l".  Either
+     this works, or it bombs out with some complaint.  In that case,
+     please let us know (see valgrind.kde.org/bugs.html).
 
 Important!  Do not move the valgrind installation into a place
 different from that specified by --prefix at build time.  This will