diff --git a/TODO b/TODO
index 9ece20c6..fa708008 100644
--- a/TODO
+++ b/TODO
@@ -1,3 +1,14 @@
+- argh vipsthumbnail
+
+	vips copy wtc.jpg wtc.png
+	vipsthumbnail wtc.png -s 1024
+
+  $ time vipsthumbnail wtc.png -s 1024
+  vips warning: linecache: error reading tile 0x8064: vipspng: Not enough image data
+  vips warning: linecache: error reading tile 0x8072: vipspng: Read Error
+  vips warning: linecache: error reading tile 0x8080: vipspng: Read Error
+  etc. 
+
 
 - look at