diff --git a/TODO b/TODO
index dc2f71ec..1f3a9387 100644
--- a/TODO
+++ b/TODO
@@ -1,3 +1,14 @@
+- try
+
+	http://www.camerafv5.com/files/photos/raw1/rope.dng
+	$ vips colourspace rope.dng 3.tif[compression=jpeg,Q=90,tile,tile-width=512,tile-height=512] srgb
+
+  tries to save a 16-bit image?
+
+  hangs 50% of the time, the other 50 it fails with a 16-bit error
+
+- save a 16-bit image to tiff with jpg compression ... should it autoconvert?
+
 - tiff write does not support [strip]
 
 - add more webp tests to py suite