diff --git a/README.md b/README.md
index 43fa07e..4d2baeb 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 A [telescope.nvim](https://github.com/nvim-telescope/telescope.nvim) extension that offers intelligent prioritization when selecting files from your editing history.
 
-Using an implementation of Mozilla's [Frecency algorithm](https://developer.mozilla.org/en-US/docs/Mozilla/Tech/Places/Frecency_algorithm) (used in [Firefox's address bar](https://support.mozilla.org/en-US/kb/address-bar-autocomplete-firefox)), files edited _frecently_ are given higher precedence in the list index.
+Using an implementation of Mozilla's [Frecency algorithm](https://web.archive.org/web/20210421120120/https://developer.mozilla.org/en-US/docs/Mozilla/Tech/Places/Frecency_algorithm) (used in [Firefox's address bar](https://support.mozilla.org/en-US/kb/address-bar-autocomplete-firefox)), files edited _frecently_ are given higher precedence in the list index.
 
 As the extension learns your editing habits over time, the sorting of the list is dynamically altered to prioritize the files you're likely to need.