diff --git a/tests/hwsim/vm/README b/tests/hwsim/vm/README
index 8fef72c86..4cea85b98 100644
--- a/tests/hwsim/vm/README
+++ b/tests/hwsim/vm/README
@@ -25,7 +25,7 @@ cycle. For example, a 4 core system with 4 GB of RAM can easily run 8
 parallel VMs (assuming valgrind is not used with its higher memory
 requirements). This can be run with:
 
-./parallel-vm.sh <number of VMs> [arguments..]
+./parallel-vm.py <number of VMs> [arguments..]
 
 
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