diff --git a/Readme.txt b/Readme.txt
index f0f2ccb..7616ef7 100644
--- a/Readme.txt
+++ b/Readme.txt
@@ -1,4 +1,18 @@
-There is just one Matlab code for simulation.
+main code:
 
-Please see:
-mmwave_objectdetection.m file
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+/mmwave_objectdetection.m
+    Please run mmwave_objectdetection.m directly.
+    Parameters can be changed in mmwave_objectdetection.m
+
+other files:
+/mapping.m
+   same as HW1 OFDM code
+
+/depamming.m
+   same as HW1 OFDM code
+   
+/ploti.m
+   to create figure
+   
+/form_raw_rx_dec.m
+   to merge 4 reflected signal at receiver end
\ No newline at end of file