diff --git a/source/games/duke/src/actors_lava.cpp b/source/games/duke/src/actors_lava.cpp
index 989be676d..f0abd8c0e 100644
--- a/source/games/duke/src/actors_lava.cpp
+++ b/source/games/duke/src/actors_lava.cpp
@@ -2,6 +2,7 @@
 /*
 Copyright (C) 1996, 2003 - 3D Realms Entertainment
 Copyright (C) 2017-2019 Nuke.YKT
+Copyright (C) 2020 - Christoph Oelckers
 
 This file is part of Duke Nukem 3D version 1.5 - Atomic Edition
 
diff --git a/source/games/duke/src/actors_r.cpp b/source/games/duke/src/actors_r.cpp
index 5740752d9..07548abe2 100644
--- a/source/games/duke/src/actors_r.cpp
+++ b/source/games/duke/src/actors_r.cpp
@@ -2,6 +2,7 @@
 /*
 Copyright (C) 1996, 2003 - 3D Realms Entertainment
 Copyright (C) 2017-2019 Nuke.YKT
+Copyright (C) 2020 - Christoph Oelckers
 
 This file is part of Duke Nukem 3D version 1.5 - Atomic Edition
 
diff --git a/source/games/duke/src/bowling.cpp b/source/games/duke/src/bowling.cpp
index 392699518..ec48f3f16 100644
--- a/source/games/duke/src/bowling.cpp
+++ b/source/games/duke/src/bowling.cpp
@@ -2,6 +2,7 @@
 /*
 Copyright (C) 1996, 2003 - 3D Realms Entertainment
 Copyright (C) 2017-2019 Nuke.YKT
+Copyright (C) 2020 - Christoph Oelckers
 
 This file is part of Duke Nukem 3D version 1.5 - Atomic Edition
 
diff --git a/source/games/duke/src/gamedef.cpp b/source/games/duke/src/gamedef.cpp
index c8cfc3967..711ffa248 100644
--- a/source/games/duke/src/gamedef.cpp
+++ b/source/games/duke/src/gamedef.cpp
@@ -1,6 +1,7 @@
 //-------------------------------------------------------------------------
 /*
 Copyright (C) 1996, 2003 - 3D Realms Entertainment
+Copyright (C) 2020 - Christoph Oelckers
 
 This file is part of Enhanced Duke Nukem 3D version 1.5 - Atomic Edition
 
diff --git a/source/games/duke/src/sectors.cpp b/source/games/duke/src/sectors.cpp
index 64c98ac49..e4807d912 100644
--- a/source/games/duke/src/sectors.cpp
+++ b/source/games/duke/src/sectors.cpp
@@ -2,6 +2,7 @@
 /*
 Copyright (C) 1996, 2003 - 3D Realms Entertainment
 Copyright (C) 2000, 2003 - Matt Saettler (EDuke Enhancements)
+Copyright (C) 2020 - Christoph Oelckers
 
 This file is part of Enhanced Duke Nukem 3D version 1.5 - Atomic Edition
 
diff --git a/source/games/duke/src/sectors_d.cpp b/source/games/duke/src/sectors_d.cpp
index cbe3e173c..56f866496 100644
--- a/source/games/duke/src/sectors_d.cpp
+++ b/source/games/duke/src/sectors_d.cpp
@@ -2,6 +2,7 @@
 /*
 Copyright (C) 1996, 2003 - 3D Realms Entertainment
 Copyright (C) 2000, 2003 - Matt Saettler (EDuke Enhancements)
+Copyright (C) 2020 - Christoph Oelckers
 
 This file is part of Enhanced Duke Nukem 3D version 1.5 - Atomic Edition
 
diff --git a/source/games/duke/src/sectors_r.cpp b/source/games/duke/src/sectors_r.cpp
index 23b032dc0..9f833e455 100644
--- a/source/games/duke/src/sectors_r.cpp
+++ b/source/games/duke/src/sectors_r.cpp
@@ -2,6 +2,7 @@
 /*
 Copyright (C) 1996, 2003 - 3D Realms Entertainment
 Copyright (C) 2017-2019 Nuke.YKT
+Copyright (C) 2020 - Christoph Oelckers
 
 This file is part of Duke Nukem 3D version 1.5 - Atomic Edition