doc updated

README.md

@@ -791,6 +791,15 @@ sim_files="
 "
 ```
 
+**Traces to be used in each of the simulation setups have to be explicitly added to the traces list**.
+
+```bash
+traces="
+ddr3_example.stl
+mediabench-unepic_32.stl
+"
+```
+
 The script runs one instance of DRAMSys for each of the files in the list. **The multiple instances run in parallel**.
 
 For more information check the documentation in [DRAMSylva folder](DRAMSys/library/resources/scripts/DRAMSylva).