diff --git a/run/macros/beamSpotWithCut.C b/run/macros/beamSpotWithCut.C
index cccf83c..6e6da54 100644
--- a/run/macros/beamSpotWithCut.C
+++ b/run/macros/beamSpotWithCut.C
@@ -1,7 +1,7 @@
 // To run root without logon screen and script use: root -l -n
 // To run a named macro in root use:
 //.L beamSpotWithCut.C
-// beamSpotWithCut("data/sr1_1100.root")
+// beamSpotWithCut("data/sr1_1100.root", 10)
 
 #include <string>
 #define NSIZE 100000