diff --git a/check_synology.py b/check_synology.py
index 4dbab99..9c4e2e7 100755
--- a/check_synology.py
+++ b/check_synology.py
@@ -211,7 +211,7 @@ def main(args):
                 'unit': 'C'
             }
         })
-    elif args.choice == 'disk':
+    elif args.choice == 'disks':
         data = walk_snmp(args.host, args.community, SnmpDisk.disk.value)
         disk_indices = set(key.split('.')[-1] for key in data.keys())
         disk_data = []
@@ -251,7 +251,7 @@ if __name__ == '__main__':
     parser = argparse.ArgumentParser()
     parser.add_argument('-H', '--host', required=True, help='The host to connect to.')
     parser.add_argument('-c', '--community', required=True, help='The community name.')
-    parser.add_argument('-C', '--choice', required=True, choices=['mem', 'load', 'status', 'disk', 'storage', 'network'], help='What to check.')
+    parser.add_argument('-C', '--choice', required=True, choices=['mem', 'load', 'status', 'disks', 'storage', 'network'], help='What to check.')
 
     parser.add_argument('--warn-mem', type=int, default=75, help='Memory usage percent to warn at. Default: 75%')
     parser.add_argument('--crit-mem', type=int, default=90, help='Memory usage percent to crit at. Default: 90%')