diff --git a/README_DEVELOPERS b/README_DEVELOPERS
index f05b8485e..d5f7a9931 100644
--- a/README_DEVELOPERS
+++ b/README_DEVELOPERS
@@ -66,7 +66,7 @@ To run Valgrind under Valgrind:
 
 (4) Choose a very simple program (date) and try
 
-    outer/.../bin/valgrind --weird-hacks=enable-outer --trace-children=yes  \
+    outer/.../bin/valgrind --sim-hints=enable-outer --trace-children=yes  \
        --tool=cachegrind -v inner/.../bin/valgrind --tool=none -v prog
 
 If you omit the --trace-children=yes, you'll only valgrind inner's launcher