diff --git a/doc/filters.texi b/doc/filters.texi
index 52f67fbd0c..6b8d2c314c 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -29642,7 +29642,7 @@ Set the initial y position. Must be a floating point value between
 
 Generate various test patterns, as generated by the MPlayer test filter.
 
-The size of the generated video is fixed, and is 256x256.
+The size of the generated video is fixed, and is 512x512.
 This source is useful in particular for testing encoding features.
 
 This source accepts the following options: