diff --git a/reports/guided_reports.pl b/reports/guided_reports.pl
index 3cae7cd546..5059e9502a 100755
--- a/reports/guided_reports.pl
+++ b/reports/guided_reports.pl
@@ -1083,6 +1083,9 @@ sub get_prepped_report {
     my ($sql, $param_names, $sql_params ) = @_;
 
     # First we split out the placeholders
+    # This part of the code supports using [[ table.field | alias ]] in the
+    # query and replaces it by table.field AS alias. Not sure why we would
+    # need it if we can type the latter (which is simpler)?
     my @split = split /\[\[|\]\]/,$sql;
     my $headers;
     for(my $i=0;$i<$#split/2;$i++){ #The placeholders are always the odd elements of the array