diff --git a/demo4_scale_out.py b/demo4-1_scale_out.py
similarity index 100%
rename from demo4_scale_out.py
rename to demo4-1_scale_out.py
diff --git a/demo4_scale_out_add_worker.py b/demo4-2_scale_out_add_worker.py
similarity index 100%
rename from demo4_scale_out_add_worker.py
rename to demo4-2_scale_out_add_worker.py