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diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi
index 7d7e97503a..d948c6d658 100644
--- a/doc/bitstream_filters.texi
+++ b/doc/bitstream_filters.texi
@@ -215,6 +215,15 @@ insert the string ``hello'' associated with the given UUID.
@item delete_filler
Deletes both filler NAL units and filler SEI messages.
+@item level
+Set the level in the SPS. Refer to H.264 section A.3 and tables A-1
+to A-5.
+
+The argument must be the name of a level (for example, @samp{4.2}), a
+level_idc value (for example, @samp{42}), or the special name @samp{auto}
+indicating that the filter should attempt to guess the level from the
+input stream properties.
+
@end table
@section h264_mp4toannexb