diff --git a/vision/imagemagick.md b/vision/imagemagick.md
index a4e9080..ecdea50 100644
--- a/vision/imagemagick.md
+++ b/vision/imagemagick.md
@@ -48,16 +48,24 @@ The 'fuzz' option tells the computer that 'close to white' is fine.  You might w
 
 # Mass convert
 
-This script converts all jpg and png files in a directory to svg.
+This script converts all jpg files in a directory to svg.
 
 ```
-for i in *png *jpg
-do for j in *$i
-do convert $j -resize 2048 $(ls $j | sed s#.$i\$#.svg#)
-done
+for i in  *jpg
+do convert "$i" $(ls "$i" | sed s#jpg\$#svg#)
 done
 ```
 
+# SVG
+
+The above script has crappy results.
+It's better to use potrace.
+
+```
+$convert input.jpg output.ppm
+$potrace -s output.ppm -o svgout.svg
+```
+
 # Writing Words
 
 [docs](https://www.imagemagick.org/Usage/text/)