diff --git a/src/configure/auto_mozilla.rs b/src/configure/auto_mozilla.rs
index d53b5a8c5c..eb93b03e9f 100644
--- a/src/configure/auto_mozilla.rs
+++ b/src/configure/auto_mozilla.rs
@@ -1,6 +1,6 @@
 //! # Thunderbird's Autoconfiguration implementation
 //!
-//! Documentation: <https://developer.mozilla.org/en-US/docs/Mozilla/Thunderbird/Autoconfiguration>
+//! Documentation: <https://web.archive.org/web/20210624004729/https://developer.mozilla.org/en-US/docs/Mozilla/Thunderbird/Autoconfiguration>
 use std::io::BufRead;
 use std::str::FromStr;