diff --git a/README.md b/README.md
index 3dd4d4c..657b826 100644
--- a/README.md
+++ b/README.md
@@ -24,8 +24,12 @@ glyph_mapping
 Variation of the `DVP` sample that processes the camera input through a simple
 DOS 8×8 font glyph-mapping algorithm and shows it on the display.
 
+[README](src/glyph_mapping/README.md)
+
 dump_otp
 --------
 
 Dumps the contents of the OTP (One-Time Programmable memory) of the K210 CPU to
 serial output in Intel HEX format.
+
+[README](src/dump_otp/README.md)
diff --git a/src/dump_otp/main.c b/src/dump_otp/main.c
index 7c3c07e..2673783 100644
--- a/src/dump_otp/main.c
+++ b/src/dump_otp/main.c
@@ -1,3 +1,17 @@
+/* Copyright 2019 W.J. van der Laan
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 #include <stdio.h>
 #include <string.h>
 #include "sysctl.h"