use

diff --git a/csv_extractor b/csv_extractor
index b1c2a2e..79c2458 100755 (executable)
--- a/csv_extractor
+++ b/csv_extractor
@@ -5,6 +5,8 @@
 # * add getopt support
 # * use tag generator to expand list of wanted fields?
 
+# csv-extractor FILENAME FIELD_LIST
+
 use strict;
 use warnings;