diff --git a/client/gen_pm3mfsim_script.sh b/client/gen_pm3mfsim_script.sh
index 73c7a4dd4..3adb8e420 100644
--- a/client/gen_pm3mfsim_script.sh
+++ b/client/gen_pm3mfsim_script.sh
@@ -11,7 +11,7 @@ show_usage()
 {
     echo
     echo "Usage:"
-    echo "${0##/} input_eml_without_extension output.pm3scr"
+    echo "${0##/} input_eml_without_extension output.cmd"
     exit
 }