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diff --git a/elisp/geiser-imenu.el b/elisp/geiser-imenu.el
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+;;; geiser-imenu.el -- Tweaks to imenu configuration  -*- lexical-binding: t; -*-
+
+;; Copyright (c) 2022 Jose Antonio Ortega Ruiz
+
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the Modified BSD License. You should
+;; have received a copy of the license along with this program. If
+;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
+
+;; Start date: Wed Oct 12, 2022 01:43
+
+
+(require 'geiser-impl)
+
+(require 'imenu)
+(require 'scheme)
+
+(defvar geiser-imenu-generic-expression
+  (mapcar (lambda (e)
+            `(,(car e)
+              ,(concat "^\\(?: *\\)" (substring (cadr e) 1))
+              ,@(cddr e)))
+          scheme-imenu-generic-expression))
+
+(defvar geiser-imenu--nested-defs nil)
+(geiser-impl--register-local-variable
+ 'geiser-imenu--nested-defs 'nested-definitions nil
+ "A flag indicating whether this implementation accepts nested definitions.
+For instance, R6%S library forms will contain them.")
+
+(defun geiser-imenu-declare-nested-definitions (impl)
+  "Declare IMPL as one that accepts nested definitions."
+  (add-to-list 'geiser-imenu--nested-definition-impls impl))
+
+(defun geiser-imenu-setup (activate)
+  "Adjust imenu for the current implementation."
+  (setq-local imenu-generic-expression
+              (if (and activate geiser-imenu--nested-defs)
+                  geiser-imenu-generic-expression
+                scheme-imenu-generic-expression)))
+
+(provide 'geiser-imenu)
+;;; geiser-imenu.el ends here