diff --git a/youtube_dl/options.py b/youtube_dl/options.py
index 0a0641bd4..8424c550d 100644
--- a/youtube_dl/options.py
+++ b/youtube_dl/options.py
@@ -774,7 +774,7 @@ def parseOpts(overrideArguments=None):
         action='store_true', dest='writethumbnail', default=False,
         help='Write thumbnail image to disk')
     thumbnail.add_option(
-        '--write-all-thumbnails',
+        '--all-thumbnails', '--write-all-thumbnails',
         action='store_true', dest='write_all_thumbnails', default=False,
         help='Write all thumbnail image formats to disk')
     thumbnail.add_option(