Hi,

patch attached.
From 60bf479bb8c502163084cc9ed545f98b23ec3d9f Mon Sep 17 00:00:00 2001
From: Paul B Mahol <one...@gmail.com>
Date: Sun, 17 Jan 2016 11:13:33 +0100
Subject: [PATCH] doc/filters: add yet another fftfilt example

Signed-off-by: Paul B Mahol <one...@gmail.com>
---
 doc/filters.texi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/filters.texi b/doc/filters.texi
index f4bda6a..d8e3317 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -6468,6 +6468,12 @@ Sharpen:
 fftfilt=dc_Y=0:weight_Y='1+squish(1-(Y+X)/100)'
 @end example
 
+@item
+Blur:
+@example
+fftfilt=dc_Y=0:weight_Y='exp(-4 * ((Y+X)/(W+H)))'
+@end example
+
 @end itemize
 
 @section field
-- 
1.9.1

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