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-rw-r--r--doc/bitstream_filters.texi4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi
index a6a5a331f5..14f35893d3 100644
--- a/doc/bitstream_filters.texi
+++ b/doc/bitstream_filters.texi
@@ -103,7 +103,9 @@ DTS-HD.
@section dump_extra
-Add extradata to the beginning of the filtered packets.
+Add extradata to the beginning of the filtered packets except when
+said packets already exactly begin with the extradata that is intended
+to be added.
@table @option
@item freq