diff --git a/TODO.markdown b/TODO.markdown
index f46896f1..46d679ab 100644
--- a/TODO.markdown
+++ b/TODO.markdown
@@ -7,6 +7,7 @@
     * sign
     * verify
 * Use BIND10 memory efficient zone structure?
+* make more use of io.Reader/io.Writer
 
 ## Nice to have