diff --git a/README.md b/README.md
index e220fce..6072bef 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,6 @@ For the Mini-DIN 6 socket, pins should be connected as follows:
 
 ## References
  
-* [Similar project based on stm32f0discovery kit](http://www.synack.net/~bbraun/mackbd/index.html),
+* [Similar project based on stm32f0discovery kit](https://web.archive.org/web/20190414143235/http://www.synack.net/~bbraun/mackbd/index.html),
 * Mac Hardware Info (ftp://ftp.apple.asimov.net/pub/apple_II/documentation/macintosh/Mac%20Hardware%20Info%20-%20Mac%20128K.pdf) - contains the description of the protocol,
 * [Mac Plus keyboard rawcodes](https://github.com/altercation/tmk_firrmware_hhkb_teensy2/blob/master/protocol/m0110.c).