update readme and todo

1 files changed, 1 insertions, 0 deletions

diff --git a/TODO.md b/TODO.md
index 14b78da..e17b9eb 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,6 +4,7 @@
 
 * [ ] find way to render data into image files
     * [x] read/write grids to/from file
+    * [ ] create image with ImageMagick core/wand
 * [x] write serial
     * [x] mandelbrot
     * [x] multibrot