diff --git a/doc/faq.texi b/doc/faq.texi
index 71a5b9ea1b..b9088993d4 100644
--- a/doc/faq.texi
+++ b/doc/faq.texi
@@ -327,4 +327,11 @@ and libmpdemux/demux_lavf.c in MPlayer sources.
 
 The standard MSys bash (2.04) is broken. You need to install 2.05 or later.
 
+@section I tried to pass rtp packets into a decoder, it doesnt work
+
+Of course not, you MUST strip ALL rtp headers and assemble valid packets
+first, a mp3 decoder decodes mp3 packets not bastarized mp3 encapsulated in
+rtp, the same applies to all decoders, this is not even ffmpeg or libavcodec
+specific
+
 @bye