diff --git a/env/rust.scm b/env/rust.scm
index 7177697..b6325d7 100644
--- a/env/rust.scm
+++ b/env/rust.scm
@@ -72,6 +72,7 @@
                           0 7))
       (item rustup-init-script-derivation)))))
 
+;; TODO This is ridiculous.  Should get rid of it somehow.
 (define (call-with-guix-shell-hacks proc)
   "Overcome several pitfails calling launch-environment/container procedure we
 aren't supposed to.  PROC is passed curried launch-environment/container