Fix link in contributing page
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 10598e7..9d61fee 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -307,7 +307,7 @@
[gsearchdocs]: https://www.google.com/search?q=site:doc.rust-lang.org+your+query+here
[rif]: http://internals.rust-lang.org
[rr]: https://doc.rust-lang.org/book/README.html
-[tlgba]: http://tomlee.co/2014/04/03/a-more-detailed-tour-of-the-rust-compiler/
+[tlgba]: http://tomlee.co/2014/04/a-more-detailed-tour-of-the-rust-compiler/
[ro]: http://www.rustaceans.org/
[rctd]: ./COMPILER_TESTS.md
[cheatsheet]: http://buildbot.rust-lang.org/homu/
