diff --git a/Makefile b/Makefile
index c3a61157a92f8eacd600aa6e82b4f4965cfe13f4..abf6d9360b936299da68882a883bb0fb48080762 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,14 @@
+#-------------------------------------------------------------------------------
+# This file is part of PyZenKit package.
+#
+# Copyright (C) since 2016 CESNET, z.s.p.o (http://www.ces.net/)
+# Copyright (C) since 2015 Jan Mach <honza.mach.ml@gmail.com>
+# Use of this package is governed by the MIT license, see LICENSE file.
+#
+# This project was initially written for personal use of the original author. Later
+# it was developed much further and used for project of author`s employer.
+#-------------------------------------------------------------------------------
+
 #
 # Minimal makefile for Sphinx documentation
 #
diff --git a/Makefile-dep b/Makefile-dep
index 849d6a327c8f1ce8cdb6cfabee3975af79f848c7..11eb1e305f8a55f25f0a5d2f1e5aadd42a22fbab 100644
--- a/Makefile-dep
+++ b/Makefile-dep
@@ -1,6 +1,12 @@
 #-------------------------------------------------------------------------------
-# Copyright (C) since 2016 Jan Mach <honza.mach.ml@gmail.com>
-# Use of this source is governed by the MIT license, see LICENSE file.
+# This file is part of PyZenKit package.
+#
+# Copyright (C) since 2016 CESNET, z.s.p.o (http://www.ces.net/)
+# Copyright (C) since 2015 Jan Mach <honza.mach.ml@gmail.com>
+# Use of this package is governed by the MIT license, see LICENSE file.
+#
+# This project was initially written for personal use of the original author. Later
+# it was developed much further and used for project of author`s employer.
 #-------------------------------------------------------------------------------
 
 DOCDIR = doc
diff --git a/setup.py b/setup.py
index d0a5c1de22e94e414b34537186f7f5d5d3271965..a817628f8c860eb798e20f4562141c2de513d995 100644
--- a/setup.py
+++ b/setup.py
@@ -1,8 +1,14 @@
 #!/usr/bin/python3
 # -*- coding: utf-8 -*-
 #-------------------------------------------------------------------------------
-# Copyright (C) since 2016 Jan Mach <email@jan-mach.cz>
-# Use of this source is governed by the MIT license, see LICENSE file.
+# This file is part of PyZenKit package.
+#
+# Copyright (C) since 2016 CESNET, z.s.p.o (http://www.ces.net/)
+# Copyright (C) since 2015 Jan Mach <honza.mach.ml@gmail.com>
+# Use of this package is governed by the MIT license, see LICENSE file.
+#
+# This project was initially written for personal use of the original author. Later
+# it was developed much further and used for project of author`s employer.
 #-------------------------------------------------------------------------------
 
 # Resources: