Mention where to find keys in --dump-json (Fixes #2648)

diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index 6af4b8aee96c8d937940dddf103a63e220b24004..f3b2be0c1e0fbdd71ca146516356a588daca05c5 100644 (file)
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -395,7 +395,7 @@ def parseOpts(overrideArguments=None):
             help='simulate, quiet but print output format', default=False)
     verbosity.add_option('-j', '--dump-json',
             action='store_true', dest='dumpjson',
-            help='simulate, quiet but print JSON information', default=False)
+            help='simulate, quiet but print JSON information. See --output for a description of available keys.', default=False)
     verbosity.add_option('--newline',
             action='store_true', dest='progress_with_newline', help='output progress bar as new lines', default=False)
     verbosity.add_option('--no-progress',