From 4e0686df390908e8fb8fc0c4ef50252626c3c656 Mon Sep 17 00:00:00 2001
From: Fei Wang <fei.w.wang-at-intel.com@ffmpeg.org>
Date: Fri, 5 Aug 2022 14:11:18 +0800
Subject: doc/filters: correct description of overlay_vaapi

Signed-off-by: Fei Wang <fei.w.wang@intel.com>
Reviewed-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>
---
 doc/filters.texi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/filters.texi b/doc/filters.texi
index fd894bcaf1..af7d60ca44 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -26181,8 +26181,8 @@ Set the height of the overlaid video on the main video.
 Default value is the height of input overlay video.
 
 @item alpha
-Set blocking detection thresholds. Allowed range is 0.0 to 1.0, it
-requires an input video with alpha channel.
+Set transparency of overlaid video. Allowed range is 0.0 to 1.0.
+Higher value means lower transparency.
 Default value is @code{0.0}.
 
 @end table
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