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-rw-r--r--youtube_dl/extractor/common.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 6fa60622e..f34d36cb0 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -51,7 +51,8 @@ class InfoExtractor(object):
Calculated from the format_id, width, height.
and format_note fields if missing.
* format_id A short description of the format
- ("mp4_h264_opus" or "19")
+ ("mp4_h264_opus" or "19").
+ Technically optional, but strongly recommended.
* format_note Additional info about the format
("3D" or "DASH video")
* width Width of the video, if known