filters.texi: restore mistakenly removed section name for noformat

diff --git a/doc/filters.texi b/doc/filters.texi
index c7e2d9d..9b39ea5 100644 (file)
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1314,6 +1314,8 @@ Negate input video.
 This filter accepts an integer in input, if non-zero it negates the
 alpha component (if available). The default value in input is 0.
 
+@section noformat
+
 Force libavfilter not to use any of the specified pixel formats for the
 input to the next filter.