diff --git a/Misc/ACKS b/Misc/ACKS
index cf553b7..822a523 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -599,6 +599,7 @@
 Luke Kenneth Casson Leighton
 Tshepang Lekhonkhobe
 Marc-André Lemburg
+Mateusz Lenik
 John Lenton
 Kostyantyn Leschenko
 Christopher Tur Lesniewski-Laas