diff --git a/commands.c b/commands.c
index b7fe9f4..32b4a8b 100644
--- a/commands.c
+++ b/commands.c
@@ -1,4 +1,5 @@
-/* Copyright 2011, 2012, 2014 Bert Muennich
+/* Copyright 2011-2020 Bert Muennich
+ * Copyright 2021 nsxiv contributors
  *
  * This file is a part of nsxiv.
  *
diff --git a/image.c b/image.c
index 4440497..9a687e8 100644
--- a/image.c
+++ b/image.c
@@ -1,4 +1,5 @@
-/* Copyright 2011, 2012 Bert Muennich
+/* Copyright 2011-2020 Bert Muennich
+ * Copyright 2021 nsxiv contributors
  *
  * This file is a part of nsxiv.
  *
diff --git a/main.c b/main.c
index a107ed2..a5b381a 100644
--- a/main.c
+++ b/main.c
@@ -1,4 +1,5 @@
-/* Copyright 2011-2013 Bert Muennich
+/* Copyright 2011-2020 Bert Muennich
+ * Copyright 2021 nsxiv contributors
  *
  * This file is a part of nsxiv.
  *
diff --git a/nsxiv.h b/nsxiv.h
index 68d1726..d49e176 100644
--- a/nsxiv.h
+++ b/nsxiv.h
@@ -1,4 +1,5 @@
-/* Copyright 2011 Bert Muennich
+/* Copyright 2011-2020 Bert Muennich
+ * Copyright 2021 nsxiv contributors
  *
  * This file is a part of nsxiv.
  *
diff --git a/options.c b/options.c
index e8b82dd..13af0c7 100644
--- a/options.c
+++ b/options.c
@@ -1,4 +1,5 @@
-/* Copyright 2011 Bert Muennich
+/* Copyright 2011-2020 Bert Muennich
+ * Copyright 2021 nsxiv contributors
  *
  * This file is a part of nsxiv.
  *
diff --git a/thumbs.c b/thumbs.c
index 7e2415c..22d589f 100644
--- a/thumbs.c
+++ b/thumbs.c
@@ -1,4 +1,5 @@
-/* Copyright 2011 Bert Muennich
+/* Copyright 2011-2020 Bert Muennich
+ * Copyright 2021 nsxiv contributors
  *
  * This file is a part of nsxiv.
  *
diff --git a/util.c b/util.c
index 8cc4d4e..37b5d10 100644
--- a/util.c
+++ b/util.c
@@ -1,4 +1,5 @@
-/* Copyright 2011 Bert Muennich
+/* Copyright 2011-2020 Bert Muennich
+ * Copyright 2021 nsxiv contributors
  *
  * This file is a part of nsxiv.
  *
diff --git a/window.c b/window.c
index bfa1a71..77eb9a0 100644
--- a/window.c
+++ b/window.c
@@ -1,4 +1,5 @@
-/* Copyright 2011-2013 Bert Muennich
+/* Copyright 2011-2020 Bert Muennich
+ * Copyright 2021 nsxiv contributors
  *
  * This file is a part of nsxiv.
  *