Prepate to upload

[youtubedl] / README.md

diff --git a/README.md b/README.md
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+++ b/README.md
@@ -223,7 +223,9 @@ Alternatively, refer to the [developer instructions](#developer-instructions) fo
 
 ## Filesystem Options:
     -a, --batch-file FILE            File containing URLs to download ('-' for
-                                     stdin)
+                                     stdin), one URL per line. Lines starting
+                                     with '#', ';' or ']' are considered as
+                                     comments and ignored.
     --id                             Use only video ID in file name
     -o, --output TEMPLATE            Output filename template, see the "OUTPUT
                                      TEMPLATE" for all the info