diff --git a/Monadoro.cabal b/Monadoro.cabal
--- a/Monadoro.cabal
+++ b/Monadoro.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           Monadoro
-version:        0.4.0.0
+version:        0.4.0.1
 synopsis:       A minimalistic CLI Pomodoro timer.
 description:    A Pomodoro timer with two modes: single-pomodoro (default), and four-pomodoro (`--session`).
 category:       Tools
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@
 
 # References
 
-[^cirillo_pomodoro]: [The Pomodoro Technique](https://francescocirillo.com/pages/pomodoro-technique), Francesco Cirillo
+[^cirillo_pomodoro]: [The Pomodoro Technique](https://web.archive.org/web/20180214191438/francescocirillo.com/pages/pomodoro-technique), Francesco Cirillo
 [^haskell_blog]: https://haskellblog.wordpress.com/2015/08/05/pomodoro-timer-in-haskell/
 [^elektroingenieur]: https://github.com/Elektroingenieur
 [^belleman]: http://jeromebelleman.gitlab.io/posts/publishing/manpages/
diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,3 +1,7 @@
+monadoro (4.0.1)
+
+	* Fix a broken link in README.
+
 monadoro (4.0.0)
 
 	* Add a newline in the end of timer countdown.