diff --git a/README.md b/README.md
index ff252a1..129f0a6 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ This is NCSA Mosaic 2.7, one of the first graphical web browsers.
 If you're on Ubuntu or something like it, your time machine is fueled
 up and ready to go.  Follow the instructions below to build and run.
 
-Many thanks to [Sean MacLennan and Alan Wylie](http://seanm.ca/mosaic/) for doing the heavy lifting.  And, of course, hats off to Marc Andreessen, Eric Bina, and the rest of the [NCSA](http://www.ncsa.illinois.edu/) team for kicking things off for us.  Thanks!
+Many thanks to [Sean MacLennan and Alan Wylie](https://web.archive.org/web/20120915154245/seanm.ca/mosaic/) for doing the heavy lifting.  And, of course, hats off to Marc Andreessen, Eric Bina, and the rest of the [NCSA](http://www.ncsa.illinois.edu/) team for kicking things off for us.  Thanks!
 
 Building
 --------