diff --git a/soft/PjtKEIL_StepDFT/Src/Signal.m b/soft/PjtKEIL_StepDFT/Src/Signal.m
new file mode 100644
index 0000000..945c9b4
--- /dev/null
+++ b/soft/PjtKEIL_StepDFT/Src/Signal.m
@@ -0,0 +1 @@
+.
\ No newline at end of file