diff --git a/zfs_autobackup/CliBase.py b/zfs_autobackup/CliBase.py
index c8ffe1b..8b55c06 100644
--- a/zfs_autobackup/CliBase.py
+++ b/zfs_autobackup/CliBase.py
@@ -81,7 +81,7 @@ class CliBase(object):
         group.add_argument('--no-progress', action='store_true',
                             help=argparse.SUPPRESS)  # needed to workaround a zfs recv -v bug
         group.add_argument('--utc', action='store_true',
-                            help='Use UTC instead of local time when dealing with timestamps for both formatting and parsing. To snapshot in an ISO 8601 compliant time format you may for example specify --snapshot-format "%Y-%m-%dT%H:%M:%SZ". Changing this parameter after-the-fact (existing snapshots) will cause their timestamps to be interpreted as a different time than before.')
+                            help='Use UTC instead of local time when dealing with timestamps for both formatting and parsing. To snapshot in an ISO 8601 compliant time format you may for example specify --snapshot-format "{}-%%Y-%%m-%%dT%%H:%%M:%%SZ". Changing this parameter after-the-fact (existing snapshots) will cause their timestamps to be interpreted as a different time than before.')
         group.add_argument('--version', action='store_true',
                             help='Show version.')