diff --git a/c/todo.txt b/c/todo.txt
index 86066fc0f..0c518b38d 100644
--- a/c/todo.txt
+++ b/c/todo.txt
@@ -52,6 +52,7 @@ TOP OF LIST
   o implement mmap-backed psb/pkr via vptr intf and profile that
   o optimize!
   o RFC "there may be a header" -- ?!? use nidx-style integer-numbered columns??
+  o --no-header option ... iidx
 
 * homebrew