diff --git a/youtube_dl/options.py b/youtube_dl/options.py
index 9016e3498..d32e7142a 100644
--- a/youtube_dl/options.py
+++ b/youtube_dl/options.py
@@ -602,7 +602,7 @@ def parseOpts(overrideArguments=None):
     filesystem.add_option(
         '-A', '--auto-number',
         action='store_true', dest='autonumber', default=False,
-        help='[deprecated; use  -o "%(autonumber)s-%(title)s.%(ext)s" ] Number downloaded files starting from 00000')
+        help='[deprecated] use  -o "%(autonumber)s-%(title)s.%(ext)s" ] Number downloaded files starting from 00000')
     filesystem.add_option(
         '-t', '--title',
         action='store_true', dest='usetitle', default=False,