diff --git a/AUTHORS b/AUTHORS
index 5f792fab68..7c13a6417f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -116,6 +116,7 @@ Matthew Horsnell <matthew.horsnell@gmail.com>
 Micah Stetson <micah.stetson@gmail.com>
 Michael Elkins <michael.elkins@gmail.com>
 Michael Hoisie <hoisie@gmail.com>
+Michał Derkacz <ziutek@lnet.pl>
 Miek Gieben <miek@miek.nl>
 Mikael Tillenius <mikti42@gmail.com>
 Mike Rosset <mike.rosset@gmail.com>
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index ca3f03908f..fb1672978d 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -179,6 +179,7 @@ Michael Elkins <michael.elkins@gmail.com>
 Michael Hoisie <hoisie@gmail.com>
 Michael Shields <mshields@google.com>
 Michael T. Jones <mtj@google.com> <michael.jones@gmail.com>
+Michał Derkacz <ziutek@lnet.pl>
 Miek Gieben <miek@miek.nl> <remigius.gieben@gmail.com>
 Mikael Tillenius <mikti42@gmail.com>
 Mike Rosset <mike.rosset@gmail.com>