diff --git a/doc/faq.texi b/doc/faq.texi
index 5dac712c45..3af5bf4327 100644
--- a/doc/faq.texi
+++ b/doc/faq.texi
@@ -453,4 +453,12 @@ Even if peculiar since it is network oriented, RTP is a container like any
 other. You have to @emph{demux} RTP before feeding the payload to libavcodec.
 In this specific case please look at RFC 4629 to see how it should be done.
 
+@section AVStream.r_frame_rate is wrong, its much larger than the frame rate
+
+r_frame_rate is NOT the average framerate, it is the smallest framerate
+with which all timestamps can be accurately represented, so no it is not
+wrong if its larger than the average!
+for example if you have 25 and 30 fps content mixed then r_frame_rate
+will be 150.
+
 @bye