diff --git a/docs/journals/INDEX.md b/docs/journals/INDEX.md
index 6e94e58..34c7865 100644
--- a/docs/journals/INDEX.md
+++ b/docs/journals/INDEX.md
@@ -64,3 +64,4 @@
 - 2026-05-14 — iter bugfix-mono-cursor-print-with-class-method-arg: mono cursor advance by 1+N at poly-free-fn Var with class-constrained Forall → 2026-05-14-iter-bugfix-mono-cursor-print-with-class-method-arg.md
 - 2026-05-14 — iter bugfix-print-leak-show-ret-mode: prelude Show.show ret_mode + substitute_rigids preserves param_modes/ret_mode → 2026-05-14-iter-bugfix-print-leak-show-ret-mode.md
 - 2026-05-14 — iter rpe.1: retire per-type io/print_int|bool|float; corpus migrated to polymorphic print → 2026-05-14-iter-rpe.1.md
+- 2026-05-14 — iter rpe.1.tidy: subst.rs preserves Type::Fn modes through rebuild → 2026-05-14-iter-rpe.1.tidy.md