Add missing copyright information

diff --git a/cmd/balloon/main.go b/cmd/balloon/main.go
index 0c737c9dd794dfe9e6b5e095328e519e71fa4f5a..65d27a11e8d9f59e554f885b15d64e62250c88ba 100644 (file)
--- a/cmd/balloon/main.go
+++ b/cmd/balloon/main.go
@@ -1,3 +1,21 @@
+/*
+balloon -- Balloon password hashing function
+Copyright (C) 2016-2019 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as
+the Free Software Foundation, version 3 of the License.
+
+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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this program.  If not, see
+<http://www.gnu.org/licenses/>.
+*/
+

 package main
 
 import (
 package main
 
 import (