diff --git a/Gemfile b/Gemfile
index 369b13e7..7d16baa2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,21 @@
 # frozen_string_literal: true
 
+# BigBlueButton open source conferencing system - http://www.bigbluebutton.org/.
+
+# Copyright (c) 2018 BigBlueButton Inc. and by respective authors (see below).
+
+# This program is free software; you can redistribute it and/or modify it under the
+# terms of the GNU Lesser General Public License as published by the Free Software
+# Foundation; either version 3.0 of the License, or (at your option) any later
+# version.
+
+# BigBlueButton 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 Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public License along
+# with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
+
 source 'http://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }