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diff --git a/magick/fourier.c b/magick/fourier.c
index 9b8a3eddf041ef474e275299283f43371d54e3e2..b6cab9c385719f1224b1b8f527f782cc2943c274 100644 (file)
--- a/magick/fourier.c
+++ b/magick/fourier.c
@@ -135,7 +135,7 @@ static MagickBooleanType RollFourier(const size_t width,
     x;
 
   /*
-    Move the zero frequency (DC) from (0,0) to (width/2,height/2).
+    Move zero frequency (DC, average color) from (0,0) to (width/2,height/2).
   */
   roll=(double *) AcquireQuantumMemory((size_t) width,height*sizeof(*roll));
   if (roll == (double *) NULL)