Index: trunk/FACT++/src/rootifysql.cc
===================================================================
--- trunk/FACT++/src/rootifysql.cc	(revision 19074)
+++ trunk/FACT++/src/rootifysql.cc	(revision 19075)
@@ -75,4 +75,7 @@
         "If the first line contains '#!rootifysql', the script can be executed directly.\n"
         "\n"
+        "Columns whose name start with @ are skipped. If you want them in your output file "
+        "give them a name using AS, e.g. 'SELECT @A:=5 AS A'.\n"
+        "\n"
         "You can use variables in your sql query like @MyVar and define them on the "
         "command line. In this example with --var.MyVar=5\n"