diff --git a/README.markdown b/README.markdown
index 236c4fcd57..794e97517b 100644
--- a/README.markdown
+++ b/README.markdown
@@ -70,7 +70,7 @@ find me in #reprap on FreeNode with the nickname _Sound_.
 
 ## What's Slic3r license?
 
-Slic3r is dual-licensed under the _Perl Artistic License_ and the _AGPLv3_.
+Slic3r is licensed under the _GNU Affero General Public License, version 3_.
 The author is Alessandro Ranellucci (me).
 
 ## How can I invoke slic3r.pl using the command line?
diff --git a/lib/Slic3r.pm b/lib/Slic3r.pm
index b692e662e0..b7d6303b54 100644
--- a/lib/Slic3r.pm
+++ b/lib/Slic3r.pm
@@ -1,5 +1,8 @@
 package Slic3r;
 
+# Copyright holder: Alessandro Ranellucci
+# This application is licensed under the GNU Affero General Public License, version 3
+
 use strict;
 use warnings;