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-rw-r--r--youtube_dl/extractor/common.py7
1 files changed, 4 insertions, 3 deletions
diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 2faaf6226..cfd25cd21 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -174,9 +174,10 @@ class InfoExtractor(object):
_type "url" indicates that the video must be extracted from another
location, possibly by a different extractor. Its only required key is:
"url" - the next URL to extract.
-
- Additionally, it may have properties believed to be identical to the
- resolved entity, for example "title" if the title of the referred video is
+ The key "ie_key" can be set to the class name (minus the trailing "IE",
+ e.g. "Youtube") if the extractor class is known in advance.
+ Additionally, the dictionary may have any properties of the resolved entity
+ known in advance, for example "title" if the title of the referred video is
known ahead of time.