diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 1e7e9f8..24f360d 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -49,6 +49,7 @@ Krzysztof Kowalczyk <kkowalczyk@gmail.com>
 Kyle Kelley <kyle.kelley@rackspace.com>
 kyokomi <kyoko1220adword@gmail.com>
 Maksim Zhylinski <uzzable@gmail.com>
+Mark McDonald <macd@google.com>
 Martin-Louis Bright <mlbright@gmail.com>
 Mat Geist <matgeist@gmail.com>
 Matt Landis <landis.matt@gmail.com>