diff --git a/TODO b/TODO
index 0093c9b0..88b621f3 100644
--- a/TODO
+++ b/TODO
@@ -7,6 +7,12 @@
 
   add something to linecache (and tilecache?) to get it to display cache size
 
+  sinkdisk could use a smaller wbuffer for thinstrip .. thinstrip * nthreads high
+  ... this would reduce the size of the input caches we need during shrink
+
+  same for fatstrip ... would it be less than tile-height? 
+
+
 
 
 - vips linecache has access there twice!