diff --git a/abuild-sudo.c b/abuild-sudo.c
index 66f212a..2f34f3d 100644
--- a/abuild-sudo.c
+++ b/abuild-sudo.c
@@ -1,3 +1,12 @@
+/* abuild-sudo.c - limited root privileges for users in "abuild" group
+ *
+ * Copyright (C) 2012 Natanael Copa <ncopa@alpinelinux.org>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation. See http://www.gnu.org/ for details.
+ */
 
 #include <sys/types.h>
 
diff --git a/abump.in b/abump.in
index 10ebb8b..897b50e 100755
--- a/abump.in
+++ b/abump.in
@@ -1,5 +1,11 @@
 #!/bin/sh
 
+# abump - bump pkgver in APKBUILDs
+# Copyright (c) 2012 Natanael Copa <ncopa@alpinelinux.org>
+#
+# Distributed under GPL-2
+#
+
 program=${0##*/}
 
 die() {
diff --git a/apkgrel.in b/apkgrel.in
index f319a83..3feb4f3 100644
--- a/apkgrel.in
+++ b/apkgrel.in
@@ -1,5 +1,11 @@
 #!/bin/sh
 
+# apkgrel - display or bump pkgrel in APKBUILDs
+# Copyright (c) 2012 Natanael Copa <ncopa@alpinelinux.org>
+#
+# Distributed under GPL-2
+#
+
 program=${0##*/}
 
 do_show() {
diff --git a/checkapk.in b/checkapk.in
index 76d63eb..9c1d9fd 100644
--- a/checkapk.in
+++ b/checkapk.in
@@ -1,5 +1,11 @@
 #!/bin/sh
 
+# checkapk - find ABI breakages in package upgrades
+# Copyright (c) 2012 Natanael Copa <natanael.copa@gmail.com>
+#
+# Distributed under GPL-2
+#
+
 die() {
 	echo "$@" >&2
 	exit 1