diff --git a/scheme/ikarus.io.ss b/scheme/ikarus.io.ss
index c4affe1..4b5490d 100644
--- a/scheme/ikarus.io.ss
+++ b/scheme/ikarus.io.ss
@@ -1,3 +1,18 @@
+;;; Ikarus Scheme -- A compiler for R6RS Scheme.
+;;; Copyright (C) 2006,2007  Abdulaziz Ghuloum
+;;; 
+;;; This program is free software: you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License version 3 as
+;;; published by the Free Software Foundation.
+;;; 
+;;; 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.
+;;; 
+;;; You should have received a copy of the GNU General Public License
+;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 
 (library (io-spec)