diff --git a/swh/scheduler/cli/task_type.py b/swh/scheduler/cli/task_type.py
index 08123c1..2a84782 100644
--- a/swh/scheduler/cli/task_type.py
+++ b/swh/scheduler/cli/task_type.py
@@ -1,82 +1,82 @@
 # Copyright (C) 2016-2019  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import click
 
 from . import cli
 
 
 @cli.group('task-type')
 @click.pass_context
 def task_type(ctx):
     """Manipulate task types."""
     pass
 
 
 @task_type.command('list')
 @click.option('--verbose', '-v', is_flag=True, default=False,
               help='Verbose mode')
 @click.option('--task_type', '-t', multiple=True, default=None,
               help='List task types of given type')
 @click.option('--task_name', '-n', multiple=True, default=None,
               help='List task types of given backend task name')
 @click.pass_context
 def list_task_types(ctx, verbose, task_type, task_name):
     click.echo("Known task types:")
     if verbose:
         tmpl = click.style('{type}: ', bold=True) + '''{backend_name}
   {description}
   interval: {default_interval} [{min_interval}, {max_interval}]
   backoff_factor: {backoff_factor}
   max_queue_length: {max_queue_length}
   num_retries: {num_retries}
   retry_delay: {retry_delay}
 '''
     else:
         tmpl = '{type}:\n  {description}'
     for tasktype in sorted(ctx.obj['scheduler'].get_task_types(),
                            key=lambda x: x['type']):
         if task_type and tasktype['type'] not in task_type:
             continue
         if task_name and tasktype['backend_name'] not in task_name:
             continue
         click.echo(tmpl.format(**tasktype))
 
 
 @task_type.command('add')
-@click.argument('type', required=1)
-@click.argument('task-name', required=1)
-@click.argument('description', required=1)
+@click.argument('type', required=True)
+@click.argument('task-name', required=True)
+@click.argument('description', required=True)
 @click.option('--default-interval', '-i', default='90 days',
               help='Default interval ("90 days" by default)')
 @click.option('--min-interval', default=None,
               help='Minimum interval (default interval if not set)')
 @click.option('--max-interval', '-i', default=None,
               help='Maximal interval (default interval if not set)')
 @click.option('--backoff-factor', '-f', type=float, default=1,
               help='Backoff factor')
 @click.pass_context
 def add_task_type(ctx, type, task_name, description,
                   default_interval, min_interval, max_interval,
                   backoff_factor):
     """Create a new task type
     """
     scheduler = ctx.obj['scheduler']
     if not scheduler:
         raise ValueError('Scheduler class (local/remote) must be instantiated')
     task_type = dict(
         type=type,
         backend_name=task_name,
         description=description,
         default_interval=default_interval,
         min_interval=min_interval,
         max_interval=max_interval,
         backoff_factor=backoff_factor,
         max_queue_length=None,
         num_retries=None,
         retry_delay=None,
         )
     scheduler.create_task_type(task_type)
     click.echo('OK')