From f4a6c3b099619308bc2f7c58c5cf5ea90ae32233 Mon Sep 17 00:00:00 2001
From: Stefano Sabatini <stefasab@gmail.com>
Date: Tue, 1 May 2012 12:26:11 +0200
Subject: [PATCH] doc/filters: document x and y drawtext expression parameters

---
 doc/filters.texi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/filters.texi b/doc/filters.texi
index ae470344f4..a965e3f7e5 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1423,6 +1423,12 @@ the height of the rendered text
 
 @item text_w, tw
 the width of the rendered text
+
+@item x, y
+the x and y offset coordinates where the text is drawn.
+
+These parameters allow the @var{x} and @var{y} expressions to refer
+each other, so you can for example specify @code{y=x/dar}.
 @end table
 
 If libavfilter was built with @code{--enable-fontconfig}, then