diff --git a/main.c b/main.c
index ee0d114..4d06f49 100644
--- a/main.c
+++ b/main.c
@@ -1,4 +1,13 @@
 
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <struppi@struppi.name> wrote this file. As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.
+ * (c) 2014 Stefan Rupp
+ * ----------------------------------------------------------------------------
+ */
 
 #include <avr/io.h>
 #include "timer.h"
diff --git a/rgbyteclock.c b/rgbyteclock.c
index 26c657a..20667e3 100644
--- a/rgbyteclock.c
+++ b/rgbyteclock.c
@@ -1,4 +1,15 @@
 
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <struppi@struppi.name> wrote this file. As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.
+ * (c) 2014 Stefan Rupp
+ * ----------------------------------------------------------------------------
+ */
+
+
 
 #include "rgbyteclock.h"
 
diff --git a/rgbyteclock.h b/rgbyteclock.h
index a71f50a..c31d9e9 100644
--- a/rgbyteclock.h
+++ b/rgbyteclock.h
@@ -1,4 +1,15 @@
 
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <struppi@struppi.name> wrote this file. As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.
+ * (c) 2014 Stefan Rupp
+ * ----------------------------------------------------------------------------
+ */
+
+
 #ifndef RGBYTECLOCK_H
 #define RGBYTECLOCK_H