diff --git a/Readme.md b/Readme.md
index 86b5a6a..a9367f6 100644
--- a/Readme.md
+++ b/Readme.md
@@ -1,4 +1,4 @@
-Arduino HID Project 2.2
+Arduino HID Project 2.3
 =======================
 
 [![Join the chat at https://gitter.im/NicoHood/HID](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/NicoHood/HID?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
@@ -62,6 +62,8 @@ improve keywords.txt
 Version History
 ===============
 ```
+2.3 Release (xx.xx.2015)
+
 2.2 Release (12.04.2015)
 * added experimental, not finished nor documented HID-Bridge between 16u2 and 328/2560
 * increased HW Serial1 RX buffer size from 16 to 32 (TX still 16)
diff --git a/avr/variants/leonardo_no_usb/no_usb_isr.cpp b/avr/variants/leonardo_no_usb/no_usb_isr.cpp
index eec342f..5c5f422 100644
--- a/avr/variants/leonardo_no_usb/no_usb_isr.cpp
+++ b/avr/variants/leonardo_no_usb/no_usb_isr.cpp
@@ -1,3 +1,26 @@
+/*
+Copyright (c) 2014-2015 NicoHood
+See the readme for credit to other people.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
 #include <Arduino.h>
 #include <pins_arduino.h>
 
diff --git a/avr/variants/micro_no_usb/no_usb_isr.cpp b/avr/variants/micro_no_usb/no_usb_isr.cpp
index eec342f..5c5f422 100644
--- a/avr/variants/micro_no_usb/no_usb_isr.cpp
+++ b/avr/variants/micro_no_usb/no_usb_isr.cpp
@@ -1,3 +1,26 @@
+/*
+Copyright (c) 2014-2015 NicoHood
+See the readme for credit to other people.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
 #include <Arduino.h>
 #include <pins_arduino.h>