--- a/bench.py	Thu Aug 04 14:39:02 2016 +0800
+++ b/bench.py	Thu Aug 04 14:46:35 2016 +0800
@@ -31,7 +31,7 @@
 
 parser = ArgumentParser(description='Benchmark revisions and put results in the db.')
 group = parser.add_mutually_exclusive_group()
-group.add_argument('revsets', metavar='REVSET', default=('last(all(), 120)',), nargs='*', help='update these revisions')
+group.add_argument('revsets', metavar='REVSET', default=('last(all(), 120)',), nargs='*', help='update these revisions (default: last 120)')
 group.add_argument('--auto', metavar='MAXREVS', type=int, help='guess revisions, up to MAXREVS')
 parser.add_argument('--marks', metavar='MARKS', default='all', help='test only these commands (comma-separated, default: all)')
 parser.add_argument('--retry', action='store_true', help='try and reduce existing timings')