diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..afda473
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,26 @@
+Copyright (c) 2009-2018 tty-clock contributors
+Copyright (c) 2008-2009 Martin Duquesnoy <xorg62@gmail.com>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+* Neither the name of the  nor the names of its
+  contributors may be used to endorse or promote products derived from this
+  software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/ttyclock.c b/ttyclock.c
index 936ea4e..3c4d7ce 100644
--- a/ttyclock.c
+++ b/ttyclock.c
@@ -1,5 +1,6 @@
 /*
  *      TTY-CLOCK Main file.
+ *      Copyright © 2009-2018 tty-clock contributors
  *      Copyright © 2008 Martin Duquesnoy <xorg62@gmail.com>
  *      All rights reserved.
  *
diff --git a/ttyclock.h b/ttyclock.h
index dec099e..ba4081b 100644
--- a/ttyclock.h
+++ b/ttyclock.h
@@ -1,6 +1,7 @@
 /*
  *      TTY-CLOCK headers file.
- *      Copyright © 2008 Martin Duquesnoy <xorg62@gmail.com>
+ *      Copyright © 2009-2013 tty-clock contributors
+ *      Copyright © 2008-2009 Martin Duquesnoy <xorg62@gmail.com>
  *      All rights reserved.
  *
  *      Redistribution and use in source and binary forms, with or without