1 files changed, 3 insertions, 0 deletions
diff --git a/summain b/summain
index 7082594..1525570 100755
--- a/summain
+++ b/summain
@@ -39,6 +39,9 @@ class Summain(cliapp.Application):
                                   'MD5, SHA1, SHA224, SHA256, SHA384, SHA512; '
                                   'use once per checksum type '
                                   '(default is SHA1)')
+        self.settings.choice(['output-format', 'f'],
+                             ['rfc822', 'csv', 'json'],
+                             'choose output format (rfc822, csv, json)')
 
     def files(self, root):
         if os.path.isdir(root):