diff --git a/TODO b/TODO
index a1728bfc..dc5418ff 100644
--- a/TODO
+++ b/TODO
@@ -1,3 +1,5 @@
+- not sure about utf8 error messages
+
 - done: jpeg, tiff, csv, vips, gif, openslide (needs git master), ppm, png,
   pdf, rad, svg, webp