blur: Add comment.

1 files changed, 3 insertions, 0 deletions

diff --git a/pict.scm b/pict.scm
index c43c49a..17604d4 100644
--- a/pict.scm
+++ b/pict.scm
@@ -454,6 +454,9 @@ strings that are built from the list of attributes LST."
 ;;; XXX: Emacs doesn't render filters when the image type is SVG.  It
 ;;; only does this when the image type is 'imagemagick, i.e. when the
 ;;; SVG is first fed to ImageMagick and the raster image is displayed.
+
+;;; We have no control over whether the image is rendered with
+;;; ImageMagick or with librsvg.
 (define (blur pict radius)
   "Apply a Gaussian blur with blur RADIUS to the PICT."
   (let ((new-height (+ (pict-height pict) (* 2 radius)))