diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 7678b3de..0934ae13 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -11,11 +11,13 @@ Chris Prince <cprince@google.com>
 Chris Taylor <taylorc@google.com>
 Dan Egnor <egnor@google.com>
 Eric Roman <eroman@chromium.org>
+Hady Zalek <hady.zalek@gmail.com>
 Jeffrey Yasskin <jyasskin@google.com>
 Jói Sigurðsson <joi@google.com>
 Keir Mierle <mierle@gmail.com>
 Keith Ray <keith.ray@gmail.com>
 Kenton Varda <kenton@google.com>
+Manuel Klimek <klimek@google.com>
 Markus Heule <markus.heule@gmail.com>
 Mika Raento <mikie@iki.fi>
 Miklós Fazekas <mfazekas@szemafor.com>