explicitly name the license

Copyright (C) 2013-2020 Christian Hesse <mail@eworm.de>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

https://www.gnu.org/licenses/#GPL
https://www.gnu.org/licenses/gpl.html
https://www.gnu.org/licenses/gpl.md

1 files changed, 15 insertions, 1 deletions

diff --git a/README.md b/README.md
index bcc0890..54473c3 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,8 @@ by [MikroTik](https://mikrotik.com/aboutus) for networking tasks. This
 repository holds a number of [scripts](https://wiki.mikrotik.com/wiki/Manual:Scripting)
 to manage RouterOS devices or extend their functionality.
 
-*Use at your own risk!*
+*Use at your own risk*, pay attention to
+[license and warranty](#license-and-warranty)!
 
 Requirements
 ------------
@@ -203,6 +204,19 @@ business please consider to
 
 Thanks a lot for your support!
 
+License and warranty
+--------------------
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+[GNU General Public License](COPYING.md) for more details.
+
 Upstream
 --------