diff --git a/module/ice-9/threads.scm b/module/ice-9/threads.scm
index dec380c38..af88f900e 100644
--- a/module/ice-9/threads.scm
+++ b/module/ice-9/threads.scm
@@ -70,9 +70,6 @@
             n-for-each-par-map
             %thread-handler))
 
-;; Note that this extension also defines %make-transcoded-port, which is
-;; not exported but is used by (rnrs io ports).
-
 (eval-when (expand eval load)
   (load-extension (string-append "libguile-" (effective-version))
                   "scm_init_ice_9_threads"))