diff --git a/ports/nrf/common-hal/analogio/AnalogOut.c b/ports/nrf/common-hal/analogio/AnalogOut.c
index 7c60e324df..adafa15d5c 100644
--- a/ports/nrf/common-hal/analogio/AnalogOut.c
+++ b/ports/nrf/common-hal/analogio/AnalogOut.c
@@ -5,6 +5,13 @@
  *
  * Copyright (c) 2018 Dan Halbert for Adafruit Industries
  *
+ * 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.
  *