diff --git a/README.md b/README.md
index 2f779758abca61174c21a80b9504b600f821730c..4265d4c43c6fa4644e2262e6befd6b3336804bf3 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
 
-run: python genSurveyDFSByPointing.py pointinglistFileName outputDFSPointingFile
+run: python genSurveyDFSByPointing.py pointinglistFileName outputDFSPointingFile data_set_name
 
-example: python genSurveyDFSByPointing.py pointing_50_5_n.dat pointing_50_5_.json
+example: python genSurveyDFSByPointing.py pointing_50_5_n.dat pointing_50_5_.json csst-msc-c9-25sqdeg-v4