diff --git a/TODO b/TODO
index 5e036d01..9b84c591 100644
--- a/TODO
+++ b/TODO
@@ -1,3 +1,13 @@
+- vips_image_write() to a temp file is rather broken
+
+  things like reorder and upstream/downstream will still be keeping links after
+  write, so unreffing the input will eventually trigger a crash
+
+  rewind should break more things ... does it remove upsteam/downstream? does it
+  just need to remove reorder links?
+
+  perhaps reorder should use upstream/downstream, then it will be broken anyway
+
 - remove execption specs from libvipsCC, gcc 7.1 will complain about them
 
 - not sure about utf8 error messages on win
diff --git a/test/test_iofuncs.py b/test/test_iofuncs.py
index b4b377a1..e17757f8 100755
--- a/test/test_iofuncs.py
+++ b/test/test_iofuncs.py
@@ -83,6 +83,5 @@ class TestIofuncs(unittest.TestCase):
         self.assertEqual(im2.bands, 3)
         self.assertEqual(im2.avg(), 2)
 
-
 if __name__ == '__main__':
     unittest.main()