[FFmpeg-devel] [PATCH] doc/eval: fix/extend documentation for root() function

Stefano Sabatini stefasab at gmail.com
Wed Jan 23 19:18:48 CET 2013

 doc/eval.texi |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/doc/eval.texi b/doc/eval.texi
index 3fd6ca9..f06f7ad 100644
--- a/doc/eval.texi
+++ b/doc/eval.texi
@@ -170,8 +170,12 @@ Note, when you have the derivatives at y instead of 0,
 converge the result is undefined.
 @item root(expr, max)
-Finds x where f(x)=0 in the interval 0..max.
-f() must be continuous or the result is undefined.
+Find x where the function with argument @code{ld(0)} in @var{expr} is
+0 in the interval 0.. at var{max}.
+The value in @code{ld(0)} is modified during the computation. The
+expression must denote a continuous function or the result is
 @end table
 The following constants are available:

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