diff --git a/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/optimizer/optimizer.rkt b/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/optimizer/optimizer.rkt
index f00443c1bd..ce0c1932e4 100644
--- a/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/optimizer/optimizer.rkt
+++ b/pkgs/typed-racket-pkgs/typed-racket-lib/typed-racket/optimizer/optimizer.rkt
@@ -38,6 +38,7 @@
   (pattern :number-opt-expr)
   (pattern :fixnum-opt-expr)
   (pattern :float-opt-expr)
+  ;; TODO add optimizations for extflonums. should be easy (like structs), if it typechecks, it's the right type
   (pattern :float-complex-opt-expr)
   (pattern :vector-opt-expr)
   (pattern :string-opt-expr)