@@ -385,7 +385,12 @@ blue (default = 000000 (black)).

 @item -vn

 Disable video recording.

 @item -bt @var{tolerance}

-Set video bitrate tolerance (in bit/s).

+Set video bitrate tolerance (in bits, default 4000k).

+Has a minimum value of: (target_bitrate/target_framerate).

+In 1-pass mode, bitrate tolerance specifies how far ratecontrol is

+willing to deviate from the target average bitrate value. This is

+not related to min/max bitrate. Lowering tolerance too much has

+an adverse effect on quality.

 @item -maxrate @var{bitrate}

 Set max video bitrate (in bit/s).

 Requires -bufsize to be set.