Index: trunk/Mars/hawc/ratescan.C
===================================================================
--- trunk/Mars/hawc/ratescan.C	(revision 20001)
+++ trunk/Mars/hawc/ratescan.C	(revision 20002)
@@ -162,4 +162,6 @@
     // Read a fits with ratescan data. You can read more than one file if
     // you want to plot data from more than one day.
+    // Note: If you are not calling the macro from where the file is,
+    // you have to provide a fully qualified path!
     read("20191003.RATE_SCAN_DATA.fits");
     //read("20191004.RATE_SCAN_DATA.fits");