diff --git a/doc/muxers.texi b/doc/muxers.texi
index b6d88231ac..a308d3d7c1 100644
--- a/doc/muxers.texi
+++ b/doc/muxers.texi
@@ -858,6 +858,8 @@ Reemit PAT/PMT before writing the next packet.
 Use LATM packetization for AAC.
 @item pat_pmt_at_frames
 Reemit PAT and PMT at each video frame.
+@item system_b
+Conform to System B (DVB) instead of System A (ATSC).
 @end table
 
 @subsection Example